Took a break from HN (and others) for about 8 months at the end of 2012 and start of 2013. The HN I came back to feels very different. Everyone knows better and is eager to prove it by putting others down. Comments are no longer about the OP, but about how the OP is laughable, let me tell you how to do it . So sad.
The silent reasonable majority (that is less inclined to comment or even vote) needs a way to help curate when things get unbalanced. Think about how you might not end up actually clicking upvote on a comment that is reasonable and that you agree with but how you most definitely would downvote the snide negative comments that top HN comments sections all too frequently.