That's what the pit supporters would have you believe. The thing with these dogs though is that they often snap anyway, in spite of being treated quite well. There have been plenty of reports of seemingly docile pitbulls attack for seemingly no reason. Just as a border collie is hard-wired to herd, and a pointer is going to point, pitbulls are specifically bred for violence and aggression and so it should come as no surprise when they revert back to their genetically hard-wired nature. Just read some of this information.
The TRUTH About Pit Bulls
Yes, all dogs can bite and get mean, but pitbulls often do so for no good reason (other than their innate urge to, which people deny), and they are more dangerous because they are physically more hardy and strong. Yes, the locked jaw thing is a myth, but they DO bite very hard and refuse to let go.
Anyway that's all I have to say, you probably won't convince me and I obviously won't be convincing anyone. That's the way these controversial issues work. Just, if you have a pitbull, please keep it far, far away from me.
Edit: here's the story I was talking about earlier, about the activist woman who was killed by her pitbull. The dog was always well-behaved, and one day just snapped:
Darla Napora: Pregnant woman dies after being mauled by pet dog in living room | Mail Online
I want those things banned, haha. Scary as hell.