http://news.ycombinator.com/item?id=2402027
politics? I don't think so. Economic inequality is a very interesting social phenomenon, though it is often written about in a heated/political way.
Besides, I don't agree with the notion that mean-spirited or dumb comments or ideology-based downvoting/upvoting are limited to politics and current events. Any thread about iOS, Android, Microsoft etc. is also likely generate a lot of those comments and ideology-based up/down voting :)