Thank you for your factual answer. Regardless of where one stands on an issue such as this, he/she should never withhold ALL of the facts and only dish out those which bolsters their opinions.
Actually, it's very interesting, the history of a type such as this. It shows how genetics can adapt the same type of breed to different things. Made as a drovers dog for controlling nasty bulls, too many became bred for extreme aggression toward bulls in the "sporting" pit. Then they were adapted to gain more dog agression. Then many were mutated into a more general pet. And more recently, many have become more generally agressive - particularly with humans.
Shows how malleable the dog can be.