Several people posted recently in a thread on women, mostly espousing feminist views - only to find that someone had declined to respond to their post, but instead browsed their history and downvoted every single comment or article they had ever posted.
I have two questions:
1. Why would you come to a site like this and pollute the karma system? How does it make you smarter? How does it make anyone else on the site smarter?
2. What would be a good technical workaround? In my mind, some system that detects mass-downvoting and flags a user for review would be preferable, but what should happen then? Should the system be more lenient to higher-karma posters? Who should perform the review process? What should be done with those whom the reviewer ascertains are abusing the karma system? I would prefer some kind of lesson that is more corrective than retributive - it seems to me that people who would perform this behavior are exactly the sort of people who need some of the lessons that this site provides. Any ideas?
I want to point out that it is possible that some of these downvotes* could be honest assessments of a comment history. If a user notices you by reading one comment, that user might become interested in other comments you've written, and if this person didn't like one comment, he may also dislike other comments in which you express similar ideas.
* Which were not from me, because i have not read the conversation you linked to.
I say this because i realize that i have (arguably) done it before. I noticed a comment from one particular user which deserved to be downvoted. Then i read all the related conversations and downvoted the other comments in which that user repeated more or less the same thing. Then, i began reading earlier conversations in which that user had participated, and found that many of this user's comments were bad for similar reasons, but i did upvote about 10% of them that were good.
Overall, the user who had been downvoted saw a sudden karma drop within several minutes; they specifically made an accusation of retributive downvoting.
Long story short: on at least one occasion, a user who complained about mass downvoting was actually experiencing a rapid series of honest downvotes.