Stupidity as a mental illness

It's great to make people more aware of bad mental habits and encourage better ones, as many people have done on LessWrong.  The way we deal with weak thinking is, however, like how people dealt with depression before the development of effective anti-depressants:

  • Clinical depression was only marginally treatable.
  • It was seen as a crippling character flaw, weakness, or sin.
  • Admitting you had it could result in losing your job and/or friends.
  • Treatment was not covered by insurance.
  • Therapy was usually analytic or behavioral and not very effective.
  • People thus went to great mental effort not to admit, even to themselves, having depression or any other mental illness.
"Stupidity," like "depression," is a sloppy "common-sense" word that we apply to different conditions, which may be caused by genetics (for instance, mutations in the M1 or M3 pathways, or two copies of Thr92Ala), deep subconscious conditioning (e.g., religion), general health issues (like not getting enough sleep), environment (ignorance, lack of reward for intelligent behavior), or bad habits of thought.

Like depression, it may not be possible to develop effective behavioral therapy for stupidity until its causes are understood, the most severe cases may have physiological causes, and pharmaceutical interventions will probably be much more effective than behavioral interventions for such cases.

Like depression, as long as it's seen as shameful and incurable, people won't admit to having it and won't seek help for it, regardless of the type they have.

The only "anti-stupidity drugs" we have are nootropics.  But the nootropics we have weren't developed as nootropics.  Piracetam was, I think, developed to treat seizures.  L-DOPA was developed to treat Parkinson's.  No one knows who started using ginkgo biloba or what they used it for; it was used to treat asthma 5000 years ago.  Adderall derives from drugs used to keep soldiers awake in World War 2.

And none of them are very good against stupidity.  AFAIK, to date, not one drug has been developed by understanding and targeting the causes of different types of stupidity.  We have the tools to do this--we could, for instance, sequence a lot of peoples' DNA, give them all IQ tests, and do a genome-wide association study, as a start.

We don't research these things because society doesn't want to research them.  People don't conceive of stupidity as a disease that can be cured.  We need, somehow, to promote thinking of stupidity as a mental illness.  As something drug companies could make billions of dollars off of.

This could backfire horribly.  We could see affirmative action for stupid people.  Harvard would boast about how many stupid people it admitted.

But if we don't, we could see something worse--people will argue that stupidity isn't any worse than being smart (much as some deaf activists claim that deafness is a culture, not a disability), and demand protection of the stupid as an oppressed minority (or majority).  Like this:

We must stop glorifying intelligence and treating our society as a playground for the smart minority. We should instead begin shaping our economy, our schools, even our culture with an eye to the abilities and needs of the majority, and to the full range of human capacity. The government could, for example, provide incentives to companies that resist automation, thereby preserving jobs for the less brainy. It could also discourage hiring practices that arbitrarily and counterproductively weed out the less-well-IQ’ed. ...

When Michael Young, a British sociologist, coined the term meritocracy in 1958, it was in a dystopian satire. At the time, the world he imagined, in which intelligence fully determined who thrived and who languished, was understood to be predatory, pathological, far-fetched. Today, however, we’ve almost finished installing such a system, and we have embraced the idea of a meritocracy with few reservations, even treating it as virtuous.

                    -- David Freedman [no, not David Friedman], "The War on Stupid People," The Atlantic, July/Aug 2016

An obvious and simple first step to destigmatizing stupidity is to stop making fun of and heaping scorn on stupid people ourselves.  I've done this a lot myself, and so have many others on LW.

Stupid people controlling technology and civilizations developed by smart people are an existential threat.  To address the problem, we must destigmatize stupidity as being a disease, and treat it, before it's normalized as a protected class.

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Let's define "stupidity" as "low IQ" where IQ is measured by some standard tests.

IQ is largely hereditary (~70%, IIRC) and polygenic. This mean that attempting to "cure" it by anything short of major genetic engineering will have quite limited upside.

There are cases where IQ is depressed from its "natural" level (e.g. by exposure to lead) and these are fixable or preventable. However if you're genetically stupid, drugs or behavioral changes won't help.

we could, for instance, sequence a lot of peoples' DNA, give them all IQ tests, and do a genome-wide association study, as a start.

We could and people do that. If you're interested in IQ research, look at Greg Cochran or James Thompson or Razib Khan, etc. etc.

We could see affirmative action for stupid people. Harvard would boast about how many stupid people it admitted.

That, ahem, is exactly what's happening already :-/

IQ is largely hereditary (~70%, IIRC) and polygenic. This mean that attempting to "cure" it by anything short of major genetic engineering will have quite limited upside.

It is worth pointing out that the heritability estimates are determined from current variation, and thus are only weakly predictive of what interventions are possible but unknown. (I do expect that if there were an easy way to make improvements here, we would know about it already, but it's very possible that there are hard ways to do this.)

Just because it's genetic doesn't mean it's incurable. Some genetic diseases have been cured. I've read of drugs that increase neurogenesis, which could plausibly increase IQ. Scientists have increased the intelligence of mice by replacing their glial cells with better human ones.

A fair point, but I still expect gene-level interventions to work better and be developed noticeably earlier than any "cures" for low IQ in adults or even kids. Notably, after the low-hanging fruits have been picked (malnutrition, lead, etc.), there are no clear avenues for advancement. At the moment we don't have a clue as to where even to start looking.

Let's define "stupidity" as "low IQ" where IQ is measured by some standard tests.

That already seems pretty different to what OP is talking about. See -

"Stupidity," like "depression," is a sloppy "common-sense" word that we apply to different conditions, which may be caused by genetics (for instance, mutations in the M1 or M3 pathways, or two copies of Thr92Ala), deep subconscious conditioning (e.g., religion), general health issues (like not getting enough sleep), environment (ignorance, lack of reward for intelligent behavior), or bad habits of thought.

This seems more like stupidity is anything anti-instrumental rationality rather than IQ based. I don't necessarily disagree with anything you've said, but I'm pointing out you might be talking past one another.

So, on one hand, I agree that it would be better if people were smarter on average.

On the other hand, you're using a lot of scary labels. ... Actually, after reflecting a bit, "Stupidity is a mental illness" is the only scary label. But it is a REALLY SCARY label. As in, my overton window is probably shifted, I dunno, 2 or 3 or 4 standard deviations in your direction, compared to the average person. I know about nootropics (at the very least, that they exist). And I'm sort of familiar with this community. And I still got scared reading this.

One of the issues is is that it takes something which has previously enjoyed somewhat protected status (intelligence), and puts it on a same level of importance as ... ... I don't have an example. Weird.

I know a lot of people who are stupid in one way or another. I would hate to see "treatment" forced onto them because they're not as smart as we'd like. I get the feeling that not speaking up now means being next on the list - "when they came for X I didn't speak up because I wasn't X, when they came for Y I didn't speak up because I wasn't Y, and when they came for me there was no-one else to speak up for me".

I don't know what constitutes "stupid" for you. Is it people with, say, an IQ of 70, where their intelligence impairs them on a daily basis? Or is it people who are capable of holding down a job, but live paycheck to paycheck and vote in elections based on very questionable grounds (I don't have proper examples for you)?

I think that because there is no definition of "stupid people" provided, this becomes scary. You're targeting a population group, which was previously okay, but now they're no longer okay, and this feels like you're trying to invoke "look at these people, they need to be fixed", and maybe I'm shaping some of that feeling myself, but I don't see the underlying tone of doing good. This isn't helping others, this is helping yourself. Maybe everyone benefits. But this essay reads as something that helps just you.


In short.

Promoting research into intelligence boosting drugs: Yay

Destigmatizing stupidity into favoring intelligence: Yay

Classifying stupidity as a mental illness, forcing things like the American health system onto people who are already missing one of the success factors in life: Nay.

...

And I don't think mental illness is seen as something positive either. People with mental illnesses are dangerous, not fit for society, scary, should be kept someplace safe... I think that's the sentiment you'll get if you ask the average person (maybe they're stupid too? I don't know). Now, I don't mean to say these traits apply to people who are stupid, I mean to say that people on average think these traits apply to people with a mental illness, and that as a result, you don't want to be mentally ill, and reclassifying people who are stupid as mentally ill won't go over well. Even only because people won't actually say they can't see the emperor's clothes, lest they lose their job.


Honestly, I think if you want to go this way, you'd be better off trying to develop things that people can use for their kids. They'll buy organic foods "because it's more healthy", so they might also buy intelligence boosters for their kids so they can go to a prestige university and do great in life.

And you don't want to classify stupidity as a mental illness. You want it to be seen as a physical injury. You go to the hospital, they fix you, you're better. No shrink visits, no endless talks, no getting locked up in an internment facility.

Disclaimer: I have autism. I sometimes worry that despite functioning pretty well in society, some day, people will say "hey, these people have problems integrating with society sometimes! We should cure all the autisms!" and I'll be forcibly "cured" and have my personality (autism is a way of thinking, sometimes, so I think that this counts as part of someone's personality) altered against my will.

Compare with the deaf people, which is BOTH a culture and a disability. Same thing goes on here. I believe that a way should be found to prevent people from being born deaf/with autism (preferrably via curing in the womb, not via abortion, but if people want to abort because their unborn child is deaf/has autism I think they should be allowed to do that because it places a higher burden on the parents). I don't believe you should forcibly (or via social pressure) intervene in people who, for their entire lives, have been deaf/have autism in order to cure them. You should make the means available to them, but it's their decision.

From what I've read, most of the protest in the deaf community currently is deaf parents insisting they have the right to deny treatment and audible education to their children--which they want to do because it will be too late for the children to get the treatment themselves when they're adults. If it were possible for their children to get the treatment and learn spoken language once they grew up, and potentially leave the deaf community, parents would have less motivation to deny treatment to them as children.

I would hate to see "treatment" forced onto them because they're not as smart as we'd like.

If the analogy here is with depression, that doesn't seem a likely outcome. Depressed people don't normally have anything forced onto them, unless they make it clear that there's a substantial imminent risk that they'll actually kill themselves.

I think the things that will get a mental illness forcibly treated are (1) that it genuinely makes the person who has it unable to function independently, or (2) that it puts other people at substantial risk. Stupidity has to be really severe before it causes #1; I suppose the question is whether (in a hypothetical world where stupidity is medicalized and treatable) it would often be seen as causing #2.

I do, though, very much agree that the combination of giving "stupidity" a broad enough definition that it applies to a substantial fraction of the population and treating it as a disease seems really dangerous and open to abuse.

"Stupidity" is a...word that we apply to different conditions which may be caused by deep subconscious conditioning (e.g., religion).

Wow.

Seems a bit harsh, though after you've debated a few creationists, it doesn't seem so unsupportable.

Do you think it's factually untrue, or normatively wrong, or something?

L. : While obviously being rational is good, LW as a community seems to be promoting elitism and entitlement.

s: Rationality can be scary that way. But it is about seeking truth, and the community does happen to consist of smart people. Denying that is false humility. Similarly, a lot of ideas many people support just happen to be false. It's not our fault that our society got it wrong on so many issues. We're just after truth.

L. : How does it serve truth to label people which aren't smart as mentally ill?

s: That's terrible, of course. But that's not a flaw of rationality, nothing about rationality dictates "you have to be cruel to other people". In fact if you think about this really hard you'll see that rationality usually dictates being nice.

L: Then how come this post on LessWrong is the most upvoted thing of the last 20 submissions?

s: ...

s: I can't defend that.

L. : Oh, okay. So I'm right and Yudkowsky's site does promote entitlement and sexism.

s: wait, sexism?

L. : Yeah. The last thing I saw from LW was two men talking about what a woman needs to do to fit the role they want her to have in society.

s: Okay, but that's not Yudkowsky's fault! He is not responsible for everyone on LW! The sequences don't promote sexism-

L. : I heard HPMoR is sexist, too.

s: That's not remotely true. It actually promotes feminism. Hermione is-

L. : I'm sorry, but I think I value the thoughts of other people who are more knowledgeable about sexism over yours. At least you condemn this article, but you still hang out on this site.


Scott Alexander has said that it's society's biggest mistake to turn away from intelligence (can't find the article). Even minor increases of intelligence correlate meaningfully with all sorts of things (a negative correlation with crime being one of them afaik). Intelligence is the most powerful force in the universe. A few intelligence points on the people working on Friendly AI right now could determine the fate of our entire species. I want to make it extra clear that I think intelligence is ultra-important and almost universally good.

None of this excuses this article. None of it suggests that it's somehow okay to label stupid people as mentally ill. Rationality is about winning, and this article is losing in every sense of the word. It won't be good for the reputation of LW, it won't be good for our agenda, and it won't be good for the pursuit of truth. The only expected positive effect is making people who read it feel good. It essentially says "being intelligent is good. Being stupid is bad. Other people are stupid. They are the problem. We are better than them." Which is largely true, but as helpful as making an IQ test, and emailing a friend saying "look here I am verifiable smarter than you and being smart is the most important thing in our society!"

Okay, but that's not a content critique. I just said I think this is bad and went from there. If the article was actually making a strong case, well then it could still be bad for having an unnecessarily insulting and harmful framing that is bad for our cause, but it might be defend-able on other grounds. Maybe. We want to do both; to win and to pursue truth, and those aren't the same thing. But I strongly feel the article doesn't succeed on that front, either. Let's take a look.


It's great to make people more aware of bad mental habits and encourage better ones, as many people have done on LessWrong.

sure.

The way we deal with weak thinking is, however, like how people dealt with depression before the development of effective anti-depressants:

seems to be true.

"Stupidity," like "depression," is a sloppy "common-sense" word that we apply to different conditions, which may be caused by genetics (for instance, mutations in the M1 or M3 pathways, or two copies of Thr92Ala), deep subconscious conditioning (e.g., religion), general health issues (like not getting enough sleep), environment (ignorance, lack of reward for intelligent behavior), or bad habits of thought.

There is an implicit assumption here that being stupid requires some kind of explanation, but nothing at all in the article provides a reason of why this would be the case. Stupidity is not depression. The reason why it makes sense to label depression as a mental illness is (I assume) that it corresponds to an anomaly in the territory. Suppose we had a function, depressedness(human, time) which displayed how depressed each person on earth has been for, say, the past 10 years. I would expect to see weird behavior of that function, strange peaks over intervals of time on various people, many of whom don't have unusually high values most of the time. This would suggest that it is something to be treated.

If you did the same for intelligence, I'd expect relatively low change on the time axis (aside from an increase at young age and a decrease in the case of actual mental illnesses) and some kind of mathematically typical distribution among the person axis ranging from 60 to dunno 170 or something. I feel really strange about having to make this argument, but this is really the crux of the problem here. The article doesn't argue "here and here are stats suggesting that there are anomalies with this function, therefore there is a thing which we could sensibly describe as a mental illness" it just says "some people are dumb, here are some dumb things they do, let's label that mental illness." To sum the fallacy committed here up in one sentence, it talks about a thing without explaining why that thing should exist.

It is implied that people being ashamed of admitting to depression is a problem, and I infer that the intention is to make being stupid feel less bad by labeling their condition a "mental illness." But it clearly fails in this regard, and is almost certainly more likely to do the opposite.. It's sort of a Lose-Lose dynamic: it implies that there is some specific thing influencing a natural distribution of intelligence, some special condition that covers "stupid "people which explains why they are stupid – which likely isn't the case, in that way having low IQ is probably worse than the article was meant to imply, since there is no special condition, you just got the lower end of the stick – while also being framed in such a way that it will make unintelligent people feel worse than before, not better.

And where is the reverse causation of believing in religion causing stupidity coming from? Postulating an idea like this ought to require evidence.

The article goes on to say that we should do something to make people smarter. I totally, completely, whole-heartedly agree. But saying high IQ is better than low IQ is something that can and has been done without all of the other stuff attached to it. And research in that direction is being done already. If you wanted to make a case for why we should have more of that, then you could do that so much more effectively without all the negativity attached to it.

Here are the accusations I am making. I accuse this article of not making a good case for anything that is both true and non-obvious, on top of being offensive and harmful for our reputation, and consequently our agenda. (Even if it is correct and there is an irregularity in the intelligence function, it doesn't make a good case.) I believe that if arguments of the same quality were brought forth on any other topic, the article would be treated the same way most articles with weak content are treated: with indifference, few upvotes, and perhaps one or two comments pointing out some flaws in it (if Omega appeared before me, I would bet a lot of money on that theory with a pretty poor ratio). I'll go as far as to accuse upvoting this as a failure of rationality. I agree with Pimgd on everything they said, but I feel like it is important to point out how awful this article is, rather than treating it as a simple point of disagreement. The fact that this has 12 upvotes is really, really really bad, and a symptom of a much larger problem.

This is not how you are being nice. This is not how you promote rationality. This is not how you win.

It essentially says "being intelligent is good. Being stupid is bad. Other people are stupid. They are the problem. We are better than them."

I don't think that's all what the article is about.

There's also the fact that our society only allows people to take drugs to fix illnesses. If you redefine what happens to be an illness you redefine what can be treated with drugs. You redefine what drugs get developed by Big Pharma. You redefine what our insurance system pays for.

There's a reason about why we care about whether the FDA sees aging as a disease.

It might be that the present administration completely deregulated the FDA so that we can treat things that aren't illnesses with drugs, but that's not where we are at the moment.

Well said!

a thought/idea can only go so far before they fall on deaf ears. Does not matter how "rational" a thought is...if you cannot convey it to people...you just have an idea that is in your head.

I am a bit confused by this comment.

Is it, basically, a rant how LW is not woke enough?

It's about a set of mannerisms which many people on LW have that are really bad. I don't know what you mean by woke.

Love the idea...

I think the key disconnect here is that (AFAICT) you mean that we should treat stupidity as a mental illness in the idealized way we're trying to get everyone to treat the mentally ill (see this video: https://www.youtube.com/watch?v=0B5nfkaeplc)

We don't think of mental illness in such an accepting way yet. Maybe when we do, saying that stupidity is like mental illness is like physical illness is like something that deserves sympathy and help will make sense, but right now it sounds more like prejudice.

I see what you're saying and appreciate the insight, and will try to treat stupid people with sympathy instead of frustration, but think that this comparison doesn't quite work yet.

Our way to measure IQ is build on the core assumption that IQ doesn't really change. Our way to measure depression is on the other hand build on the assumption that depression changes over our lifetime.

We likely need a new way to measure intelligence or stupidity to say well that a treatment increases it within a span of a year.

One interesting aspect of my analysis I would like to highlight is the part on multiple selection and genetic correlations. The immediate implication is that estimates of the value of embryo selection for IQ will be considerable underestimates if they ignore the many other traits that this selection will improve, and also that it is both feasible & desirable to make selection choices based on a weighted average of many polygenic scores. But this has had much broader implications for how I conceptualize the genetics of intelligence. (The following is based on too many papers to easily list at the moment, but if you read through my genetics bibliography compilation you'll find cites for a lot of these.)

I used to think that IQ variants were relatively neutral and specific to IQ, and variance in the population was maintained by selective neutrality (ie pro-IQ variants being too metabolically expensive or developmentally fragile to be selected for) and so arguments like in OP that 'we should describe IQ boosting as instead reducing stupidity or reducing the risk of intellectual disability' were, more or less, dishonest rhetorical tricks. (The ID claim is particularly questionable; most ID is from single mutations of large effect, stuff like embryo selection isn't going to override that.) Cochran had discussed the possibility of genetic load and 'grit in the gears' from rare variants, but the GCTAs indicated that most of the additive variance was explained by rather common genetic variants (common being >1% of the population having it) and whole-genome studies looking into de novo mutations and counting rare mutation load and finding it not hugely predictive eliminated that as an explanation. So it looked to me like it was more the case that the glass was half-full and there were 'genes for IQ' rather than 'lack of genes against IQ', and the highly general benefits across health & longevity were due to downstream effects like Gottfredson argued, in being able to take care of yourself, having a long-term perspective etc.

Then a twin study suggested that the health benefits were actually genetic; the 'generalist genes' hypothesis kept popping up in psychological traits like IQ with latent factors like overall brain size not fractionating into lots of more specific traits; the high-IQ D-F and GWAS studies failed to turn up any rare positive variants which ought to exist under neutrality; the GCTA estimates kept increasing when done using better measurements & better GCTA algorithms even for diseases that could not possibly be selectively neutral or beneficial in any way and must always be selected against; studies of recent human evolution over the past few thousand years demonstrate that common variants are constantly being selected for and against, implying considerable mutation load even on common variants, and even the harmful variants from the Neanderthals still haven't been purged in Europeans; rare variants are almost always harmful but surprisingly even common SNPs up to 50% frequency tend to be harmful too*; dysgenics has been confirmed; historical human population sizes imply poor purging of bad variants; and later I began poring over the intelligence & education genetic correlations that began pouring in thanks to GCTA & LD score regression. The correlations are almost all good (except for autism) regardless of behavior or organ or disease, to the extent it's very difficult to tell plausible stories about how higher income/education/intelligence could affect all of these simultaneously so much, and the intercorrelations go well beyond as correlations between diseases are everywhere as well. (I even tried some factor analysis to see if I could pull out a single grand factor.) In short, the 'bodily integrity' hypothesis appears to be explaining the big picture.

* for example, if you take the IQ and education polygenic scores from Benyamin et al 2014 and Okbay et al 2016 and simply sum the effects from each majority SNP variant (negating as necessary), corresponding to a hypothetical modal person, both scores are >2SDs, even though you would expect ~0 since it's far from obvious that the 25% frequency version of a random SNP can be a priori expected to be harmful to education or intelligence; and a linear regression also shows that higher frequencies predict better effects. I don't know how general this is but I'm definitely curious now.

So under this scenario, what we see is not good genes 'for' intelligence so much as a high level of genetic load from lots of unexpectedly common broken genes floating around the population which haven't been able to be purged due to small individual bad effects, small effective human population sizes, fast-changing environments, introgression from other hominids like the Neanderthals, which by degrading 'upstream' biological systems like mitochondria or key proteins then have global downstream effects across the whole body & mind (regardless of conditioning on measured IQ), producing these broad genetic and phenotypic correlations between intelligence & everything under the sun. Intelligence, which so far has only been reified by neuroscience & neuroimaging down to very global brain traits like overall speed & connectivity & white-matter integrity, pops up everywhere because it is the most fragile trait, affected by coordination between the most bodily systems, more easily pushed off-kilter and degraded than traits like eye color or height. Perhaps Cochran was right all along that someone with the modal human would be much smarter, healthier, saner, and happier than the rest of us - he was just wrong in thinking the mutation load would be in rare and de novo mutations, when most of it has been lurking in common variants all along, and we're all far more screwed up than anyone guessed.

From this perspective, the fact that doing embryo selection against schizophrenia will usually also be embryo selection for intelligence, and be safe to do without nasty unintended effects, is not a surprise at all. Of course it would tend to reduce the chance of schizophrenia; it would also reduce other mental illnesses like depression or anorexia or bipolar, as well as behavioral problems like BMI, or cardiovascular problems, or...

It's not about playing God or 'being better than well', it's just realizing that no one was 'well' to begin with (anymore than people centuries ago were 'well' rather than all, even the elites, stunted from malnutrition and parasites and pandemic childhood disease and hard labor) and everyone is carrying a considerable burden of many thousands of broken variants, and some people by chance & inheritance have fewer bad variants than others and 'healthy' people merely are very similarly sick due to lots of small variants adding up to a tight normal distribution and the variance written off as simple normal variation which no one can do anything about and shouldn't worry anyone. It would be perfectly honest to describe this as trying to cure 'micro-disabilities' or 'micro-illnesses' (hey, if we can have 'micromorts' or 'microaggressions', why not?) rather than 'enhancement' or adopt a slogan like 'leveling the genetic playing field'.

If everyone is suffering these micro-sicknesses, the precautionary argument drops away, as do the fears of some suitably ironic cosmic punishment for tampering with the genome, the worries about 'selecting only for one thing', and maybe some of the Puritan objections to 'enhancement' or 'cheating'. It also provides a powerful informative prior for selection and synthesis: if in doubt, choose the most common variant.

I urge you to read the first book of the Evans Third Reich trilogy, in which one of the interesting topics mentioned revolved around eugenics. I fear that the way you've framed your point will prime people towards this direction.

To approach "stupidity", an already vague concept, from a diagnostic point of view would be a disaster. One reason being the history I linked to earlier, eugenics was a popular -enough sentiment then to be a problematic primer, and I fear that while having stupid people around is an existential risk, I think another existential risk exists in trying to optimize on human intellect without a firm foundation on the concept of "stupidity" and its communicability to the general public.

Another issue I have is your seemingly apparent faith in the psychiatric approach. The DSM 5 is, to put it lightly, a highly biased diagnosis tool with practitioners who may not be using the tool appropriately. This may not be exactly relevant, but I've noticed that the better practitioners in the social and psychiatric fields don't trust this resource. In fact, some will go out of their way to say it is an insurance scam. I personally haven't had a chance to delve into the history of the DSM, but I have noticed that the constantly shifting variability in diagnostic definitions and criteria hint at the idea that a) the DSM isn't perfect and, more importantly, b) large heaps of money is being made off of the vague notions described by this tome. Pretentious writing, even in such technical documents, are great examples of such attempts. Taking the diagnostic approach might make the stigma problem WORSE by labeling the "unfit" for later treatment, especially with an already pretentious diagnostic system. The message you're trying to send is a virtuous one to be sure, but trying to use the current psychiatric infrastructure to tackle this issue is a trap. A very profitable trap.

No one is going to impose mandatory treatments for stupidity.

A much more likely version is that at some point in the future, parents will be offered an "IQ enhancement package" for their potential kids. Do you accept? This is a much more interesting question.

In some sense bans on lead are mandatory treatments for stupidity. The same goes for government-mandated addition of iodine to salt.

The simple inroad would be intellectual disability.

Right now you're disabled if your IQ is below 70 and you have trouble functioning in your everyday life. These are 2 to 3 % of the population and there's a societal framework already in place for them.

If you could gradually raise that IQ threshold, you'd achieve much of what you want to achieve here.

I don't know who determines that threshold, but whoever it is is probably more approachable, and more likely to listen to reason, than the public at large.

We're not very good at destigmatizing and treating depression. why would we want to carry that model onto anything else?

We're quite good at both, actually, compared to every generation that came before us.