You might also consider the angle of allowing for people who generally offer valuable participation to have a bad day once in a while as opposed to those who make a hobby of being obnoxious. After all, one of the primary purposes of moderation is to maintain an environment in which the largest possible number of gun owners feel inclined to participate, and ban people for infringing on that rather than snapping the whip on anyone who says **** once in a while or gets short with someone giving him a hard time.
....when they don't agree with certain positions.