People don't realize how these violent breeds can *snap* based on the circumstances being slightly different. Until it happens.
I've told this story before, but for anyone who missed it, I think a personal account carries some kind of weight in these discussions.
When I was riding horses, the stable owner had two huge dobermans that wandered freely over the barns and paddocks every day. They were EXTREMELY well cared for and well trained. The owner was an expert horse trainer as well, and all his animals obeyed his every command. He was very good with animals. It was a busy stable and the dogs interacted freely with adults, kids, babies, everybody, on a daily basis. The dogs were super-friendly with everybody and widely beloved; they were "love bugs." This went on for years. One day I arrived a bit early at the stables and no one else was there. I casually walked into the doorway of the large barn. The two dobermans had been lying down at the other end of the aisle; they saw me; and they went for me full-speed, growling, barking and slavering, literally with red eyes, out for blood. The sounds they made I can't forget. They are fast dogs so it took only three seconds for them to be within 10 feet of me. I was literally looking death in the face. The owner had a small house near the barn and apparently had already walked toward the barn when he heard my car, so when he heard the dogs he ran up and yelled their names and they immediately stopped, and were totally submissive. If he hadn't been there, I probably wouldn't be writing this. If they had been pits, I probably wouldn't be writing this, as pits usually won't respond to their owners once they snap. Those dogs knew me, very very well. I was a 16-year-old small girl, no threat. Yet they went from pets to killers in a millisecond. Something "triggered" them. The fact that their owner wasn't right there? The fact that there weren't any other people around? The outline of a person at the barn entrance when they weren't expecting it? Well, gee, I guess I have no wish to own an animal that can go from "love bug" to "killer" in one second based on some unknown, subtle trigger.
In case you're wondering if I mischaracterized this, the barn owner, a classic cowboy tough guy, was visibly shaken. He got rid of the dogs shortly thereafter.
Dobermans are now out of fashion and pits are "in." I will never understand why people keep things like rattlesnakes and attack dogs as pets.