I'd rather be overly charitable 10 times than not charitable enough once. It probably doesn't make me any friends to say it, but let me say why. A slight exaggeration of your view might be that some people are irredeemable mutants who need to be ostracized and can't be reasoned with. I won't stay quiet when I strongly disagree with someone, but I don't need to go that far. I think it's a manifestation of the same tendencies that lead to DHH's post.