The pit bull is not a more violent dog than any other, but it is very damaging when it does attack. The bigger issue is the type of owner a pit bull attracts. Many of these people are not looking for a gentle dog. A breed ban is not a condemnation of pit bulls, rather, it is more a condemnation of those that refuse to socialize these animals properly, because we all know what happens when this dog is improperly brought up. They are big, strong dogs, and are capable of inflicting severe damage and even death. So, even though I think the breed of dog itself is not a problem, I would support a breed ban because it is really the only way to keep these dogs out of the hands of those that should not own them.
http://en.wikipedia.org/wiki/Daddy_%28dog%29