I would also say because much of that does end up on the front page or at the top of comment threads. This is an extreme case, but look at what happened after fatpeoplehate was banned:<p><a href="http:&#x2F;&#x2F;motherboard.vice.com&#x2F;read&#x2F;right-now-reddits-top-posts-are-swastikas-fat-shaming-and-ellen-pao-hate" rel="nofollow">http:&#x2F;&#x2F;motherboard.vice.com&#x2F;read&#x2F;right-now-reddits-top-posts...</a>