You can't argue rationally with dog lovers especially pit bull lovers. They're like anti-gun zealots or Obama worshipers. They simply cannot accept that the facts that contradict their worldview. Every now and then I try, but all I ever hear is that pit bulls are no worse than any other dog. It was the fault of the owner* and that the dog was provoked.
*actually this is hard to disagree with if you consider the owner to be at fault for being a big enough fool to harbor one of these vicious things.