Pit bulls are unpredictable. Take the case of a Florida boy who played with the neighbor’s two pit bulls. They were gentle and tame. Then one day they turned on him and killed him.
Take the case of my neighbor's dalmatian, who played with me every day for years. Then one day he turned and damn near took my arm off. But everybody loves dalmatians.
Take he two cases where I might have been harmed by a pit:
Similar story, female pit liked the heck out of me. One day she jumped up and nipped the hem of my levis, only nipped, then jumped back...I hadn't been told of the box full of two or three day old puppies she'd been guarding under the desk I was approaching.
Similar story but not long time pals, dog would come to me, cuddle and play. Then one day as I approached him he went to full guard mode, growled meaningfully and blocked my forward motion (didn't mind my retreat). Unless his owner was there you could get only so close to the tool box, and his job was to hold you at that line.
(We get along just fine now thanks)
PS: Tinker (80lb pit) and Fuzzy (14lb poodle) think some people are just full of $h!t, they both know that it is cocker spaniels you can't trust.