Just my opinion but if the owner was criminally responsible for the dogs actions you may see less incidents. My brother used to breed pit bulls and have never seen one even growl at anyone, if you are the stereotype pit bull owner ( think you are a bad ass with a bad ass dog ) chances are you want a fighting dog and will not bring the dog up properly to be a family dog ( which it can be ).
Dogs that in my opinion are more dangerous than a pit bull... Boer Boel, Fila Brasileiro, Chow Chow and last but not least the Caucasian Ovcharka ( perhaps the worst ).
The owners ( ones who want a tough dog ) who want a dog like the pit bull will probably get one of the above and then you will see what a dangerous dog can do.
Just to note: I would never own a pit bull because I think they are very stupid and do not look good.
As I stated, just my opinion.