I have a politics forum and even we have guidelines for such signatures. I can't think of anyone who has ever had a nazi sig. I know we've had some issues with some avatars. We received a lot of complaints when someone had an avatar of Calvin peeing on the Canadian flag and more recently we had complaints when someone had a pierced nipple as their avatar - couldn't even tell if it was male or female, but the masses didn't like it. People even complian about the Confederate flag, but not to the extent that they want it removed.