That commenter was particularly bad and we've banned the account. Still, you've also gone on tilt quite badly yourself in this thread. Please don't—it makes things worse in several ways, despite your positive intention to defend the community.
Reacting to bad comments by making the thread even worse is called feeding trolls, and it's (to quote my son from when he was 2) what we not do. Instead, when you see an egregious comment, flag it by clicking on its timestamp to go to its page, then clicking 'flag' at the top. There's a small karma threshold, currently 30, before flag links appear.
You can also email us at hn@ycombinator.com to expedite the reviewing and banning process. We do get to most of these wretched piles of slop eventually, but it takes time, and odds are we'll see an email sooner.
Edit: it looks from your account history like you've been using HN primarily (if not exclusively) to do ideological battle. That's not a legit use of this site, regardless of the correctness of your views, and we eventually ban accounts that do this—even if they remain civil, which I am sorry to see you repeatedly haven't. HN's intended use is the gratification of intellectual curiosity. The occasional political or ideological comment is fine, but if someone is using the site primarily for that, it's probably not the site they're looking for. (Note that this is true regardless of the particular politics or ideology one favors.)