The pitbull was bred to fight, in bull and bear baiting pits first, but dogfighting eventually.
ANY dog that showed human aggression during this time was immediately destroyed, since the handlers had to break the dogs apart before the valuable animals permanently damaged each other.
It is only in recent times that the dogs have been encouraged by ignorant folk and unscrupulous breeders to show any type of human aggression. Look into the history, rather than accept everything the left wing media tells you to panic about, shouting from the rooftops like a trained seal:
"PITBULL BAD PITBULL BAD!"
exactly. see my post #70