I have the same problem with reddit and digg: I like to read exceptionally downmodded comments. When comments get modded down so much that they are not displayed, and also they generate a lot of responses, it's the kind of thing I can help but look at. Like a train wreck I suppose.

It actually sucks me into the troll MORE when they get such special highlighting. I should say I do like how top level troll posts get put at the bottom for reddit.