It's easy to make grand claims like that. Where are the links? It's not ok for anyone to start flamewars on HN, and lord knows I spend enough of my life telling people so.
If you see a post that ought to have been moderated but hasn't been, the likeliest explanation is that we didn't see it. We don't come close to seeing everything that gets posted here. You can help by flagging it or emailing us at hn@ycombinator.com.
Ah ok! Actually I mostly agree with you about those comments. They lead to predictably worse discussion. However, they're in a different category than the more egregious kind that we post moderation responses to.
If you see a post that ought to have been moderated but hasn't been, the likeliest explanation is that we didn't see it. We don't come close to seeing everything that gets posted here. You can help by flagging it or emailing us at hn@ycombinator.com.