Yesterday three Foo threads were locked because of a troll whose motivations of course are difficult for normal people to understand.
The Sunday NYT Magazine has an interesting article on internet trolls:
The Trolls Among Us
I still don't understand why some people enjoy being a--holes.
However, I'm not necessarily in favor of banning trolls. The best way to deal with known trolls is to ignore them; but of course it's impossible to get a whole forum of people to ignore a troll, some people just can't resist, and that's what trolls feed on.