No personal experience with Pitbulls, but they don't like other male dogs. If you keep two males together, one might end up dead.

A nationwide ban on pitbulls would be as successful as the nationwide ban on marijuana. The amatuer breeders would get together and create some new breed of fighting dog. If pitbull were to be banned everywhere, you'd just end up with a bunch unloved, abandoned pitbulls roaming the streets.