That's one way of looking at it. Instead consider you're the primary internet caregiver of a bunch of retarded babies. You can warn us not to be retarded but we can only do so much with all these naked women, piles of cocaine, and boxes of the finest wine in our parent's basement.

I think the only reason to ban someone is that they're a clear and present danger to the well being of the site. Skeeter's insane trolling efforts come to mind, although really, if his goal was to hurt the site, I think he actually brings people in. He may be a train wreck, but people love train wrecks.