I think there's ample evidence that Pits are a dangerous breed of dog.....all dogs can be made menacing with abuse or neglect. But I doubt you'll find hundreds of accounts of a collie or golden retriever ripping innocent bystanders or even family members apart for no apparent reason other than they were around when the thing went off.....to wit:
https://www.google.com/#q=pit+bull+attacks
That's because typically, ignorant, criminal people don't gravitate towards collies and golden retrievers.
If they did, then collies and golden retrievers would be the ones *going off*.
All animals are potentially dangerous, and the more powerful they are the more potential they have to be deadly.
But pits don't just explode for no reason. If a pit isn't safe, it's because it was raised wrong.