Truly innovative, pure hacker style. But it is also true that anonymity can make people a little more... daring. I think a registration form could be a good step towards sanity: a login makes people think twice, which is usually a good thing. Just a suggestion, see if it suits you.
I'm not sure this is necessary, at least yet. People seem to be quite well-behaved so far - the only breakage is accidental (and that's mostly me anyway :-/).
