That's a criminal offence in the UK (two year prison sentence in some circumstances). Do you have a good feeling for what might count as incitement in those circumstances?
No, they don't. My blog is not all that popular. It has got some programming puzzles, Linux HOW-TOs and stuff. Most of my audience is just my friends.
So what's the best course of action? Remove comments feature entirely? Maybe that's what I should do. I wonder what everyone else's doing.
Of course that is the cynical version of it. But as others have pointed out some people dont like these sort of risk.