I completely agree with drunksunflower. Treating lostson as if he's some kind of monster (while he never acted on his thoughts) is only going to increase his self hatred and alienation. Not very supportive thing to do. If I don't like someone's presence I make use of the ignore button instead of demanding that the person leave the place.

As for the new guideline - I don't think there is ONE person in the world that never hurt anyone (both in their thoughts and reality). If thoughts could hurt I would probably be in jail for the rest of my life or longer. So I guess PC is not a place for me either.