This is one of the stupidiest things I've heard in a while...
Indeed. If someone gets himself banned, he shouldn't have any saying when other people insult him. He has obviously been insulting people himself.
And again, if someone is immature enough to get offended by stupid jokes, no lawyer is stupid enough to take his case. And the laws considering slander are different in every country. So how is it decided wheter the forum-owner should be fined or not?
BTW, how do you decide who's a public face and who's not?