Not true, the problem is that these dogs are TRAINED to kill, not born to kill. A properly-trained Staffordshire Terrier is as well-behaved as a German Shepherd.
BS!!!! My neighbor had a "Staffordshire Terrier" who was raised from a pup in a household with kids, etc. She was reasonable MOST of the time. When she would go nuts, she would chew THRU the door to the back yard or the front door or the WALL to get outside. I lived next door, and there was no one in her yard or harrassing her when she did this stunt. I saw her do it more than once. The back doors got replaced 3 times that I know of, and also the front door at least once. There was something very screwy about that dog, and I never fully trusted her, yet she had been raised from a pup with me in and out of that house for her entire life. I have had dogs all my life and will NEVER choose one with any pit bull in it.
Way back in the day we heard all the same stories about the breed du jour: GSD, Chows, Dobies, etc. It's the training more than anything.