It's quite possible to get banned here as well. Violate the TOS and you're history.
peaguy was obviously an exception, and deserved to have his arse kicked. TheoK has reportedly posted some sort of porn, but hadn't been kicked, so SP could hardly be worried about a conversation regarding anime. A question or discussion is hardly encouraging or distributing the stuff. Shit, stick it in the Adult forum if anyone is that worried. As I said, it ain't Wankplanet, and we are all meant to be 18+.
Besides, even if he carries on like a dick, what makes him any different to anyone else?