Well, getting rid of an unwanted player can be somewhat a problem, especially when you don't want to hurt people sensibility. I have been encountering the problem lately. The guy's a good friend, but he isn't in the mood of the game at all (too many years of monster bashing leave some sequels, I guess...). He is not ruining the campaign entirely, but his interventions sounds generally illogical and out of character to my players and myself. We don't really know what to do, for we know the guy would take it quite badly if we dropped him.