Pit bulls are dangerous because they were bred to fight in the "pits"--the Brits did a dirty deed when they created this dog through selecting out of types.
Well-treated pits are the most dangerous, because their MORON owners insist they "they'll just lick you to death."
A dog is not a Tabula Rasa. Border collies herd sheep. Labradors are service dogs. Bloodhounds track. Terriers are great for vermin control.
And pit bulls just should not be, at all.
As any “purebred” dog they actually have a lot of mongrel in them. If they can be bred nasty, they can also be bred nice. If we have a problem with nastiness in some strains of pit, then we have an opportunity for conscientious breeders to keep the look but lose the nastiness.