Attack dogs should be, and are, restricted. Because they can kill humans, horses, cattle, and do kill more dogs than other breeds. Assholes use these to terrorize neighborhoods, for dog fighting, and both.

My aunt had two staffies, they were amazingly affectionate with us as teens, but at night she'd cage them separately. When I asked why she had to cage them, she said if she doesn't they try to tear each other apart at night ( over perceived jealousy type stuff.)