See: You Be the Jury, The Amanda Knox Test
While we hear about Bayes' Theorem being under threat in some courts, it is nice to savor the occasional moment of rationality prevailing in the justice system, and of mistakes being corrected.
Congratulations to the Italian court system for successfully saying "Oops!"
Things go wrong in this world quite a bit, as we know. Sometimes it's appropriate to just say "hooray!" when they go right.
Discuss, or celebrate.
You're talking about killing that driver. The actual villain in the story. I don't have any particular problem with vengeance, I often advocate it. But that's an entirely different to killing Mortimer Q. Snodgrass, who lives at 128 Ordinary Ln. just because... well... you really want to kill somebody. This isn't even a case of finding a different driver who also happens to be reckless and likely to kill people like your friend. This is choosing to kill someone with a AAA driving rating who you have no reason at all to suspect is dangerous.
Even leaving aside the difference between saying that a behavior resolves as evil and calling a person evil I suggest it is you who is failing at empathy here (partially as a result of the aforementioned simple comprehension error). I am empathizing here with all the victims of blatantly irrational persecution. The lives destroyed because people use their social influence to make their community destroy others because of their own willful stupidity.
If I hear a story of a father going out and killing his daughter's murderer I would shrug, have no particular moral judgement and definitely not call the act evil but still advocate a minor prison sentence purely for pragmatic reasons. But when if that same parent started publicly declaring that somebody should be punished when no evidence supports that theory and he is being entirely stupid then I would call the act evil. Because while the damage done to innocents is amortized (sometimes it outright causes them to be killed, sometimes it does nothing) it is still a massively toxic and dangerous thing on average caused by features of my species that I detest.
I think I can resolve this. JoshuaZ would almost definitely admit that they were being irrational. What he disagrees with is you going further and calling it disgraceful and evil.
So what's the difference? He seems to have pinpointed the former term as implying that they're trying to do harm, and the latter one as adding a whole slew of extra layers of incompetence or idiocy. He argued that they aren't targeting somebody they think is innocent (thus they're not "evil"), and that their failure of irrationality was understandable (therefore not "disgraceful"). That's it.
He disagreed with you by arguing that their behavior isn't intentionally bad (as "evil" seems to imply), and that it's much more excusable than what "disgraceful" seems to connote. But you on the other hand seem to be using these terms not to make them sound like they want to harm an innocent person or are stupider than they are, but simply to stress just how destructive this sort of behavior is and can be.
As often is the case, the disagreement seems to boil down to simple miscommunication. If I'm right in my (somewhat cursory) assessment, then there's no actual difference of opinion, and this is just yet another mundane example of the words getting in the way.