Common reasons I downvote with no comment: I think the mistake is obvious to most readers (or already mentioned) and there's little to be gained from teaching the author. I think there's little insight and much noise - length, unpleasant style, politically disagreeable implications that would be tedious to pick apart (especially in tone rather than content). I judge that jerkishness is impairing comprehension; cutting out the courtesies and using strong words may be defensible, but using insults where explanations would do isn't.

On the "just a-holes" note (yes, I thought "Is this about me?"): It might be that your threshold for acceptable niceness is unusually high. We have traditions of bluntness and flaw-hunting (mostly from hackers, who correctly consider niceness noise when discussing bugs in X), so we ended up rather mean on average, and very tolerant of meanness. People who want LW to be nicer usually do it by being especially nice, not by especially punishing meanness. I notice you're on my list of people I should be exceptionally nice to, but not on my list of exceptionally nice people, which is a bad thing if you love Postel's law. (Which, by Postel's law, nobody but me has to.) The only LessWronger I think is an asshole is wedrifid, and I think this is one of his good traits.