I think banning people from a board for it can be quite sensible in some circumstances. For example, if someone suddenly starts posting bad language for no apparent reason, and they're normally very polite, I might hide their posts for a while assuming they had had a drink or two, or that they were mad about something. It would give them time to either calm down or sober up. It wouldn't be because I thought they deserved to be banned as a punishment. I would see it as more of a calming measure, and allow them to post again after a few hours.