Pit bulls have been bred over many generations to breed out their fight drive, sure some still can be dog aggressive, but many aren't. Early socialisation & training helps also to stop dog aggression. As for being harder to stop in a fight, I'd be more able to stop a 25kg Pit Bull, than a 60kg Rottweiler.
You quoted how they were bred for dog aggression, yet didn't bother with how they were bred to be human friendly, any dogs which showed people aggression were culled, or never used for breeding, that's what makes them loving & devoted pets.
Pit Bulls are now being bred for show, search & rescue, therapy dogs & family pets.
Proper socialisation; a concept which most pet owners are not familiar with is extremely important. A lack of it can turn any breed into an agressive or submissive and hence dangerous animal.