Off track? In what way? the breeding history is a matter of fact not my opinion. Certain breeds were never intended to be snuggling up to your children in the living room and any assertion to the contrary is based on emotion not fact.I think you're off track comparing any animal to a human being I find any such comparisons offensive.
Offensive as you may find it, dogs are the most socially intelligent creatures next to humans. So advanced that they actually are equivalent to 2-3 year old human beings. They are even more socially intelligent than our primate cousins. This was a matter of symbiotic evolution.
Pit Bulls are not bred to be agressive toward humans, and they never have been. In fact, the direction has been entirely the opposite: bred to be human friendly and dog-agressive. However, like some other terriers they have a very strong desire to please their human. So you find a lot of people who have a short doo-hickey between their legs and in order to compensate they get a Pit. They teach the Pit to handle their own agression towards others that they are not physically capable of handling themselves. The Pit, being the people pleaser, will do anything to get the good-boy pat on the head. Absolutely anything. It has the mind of a two year old child and does not understand guilt but it does understand and crave praise.
In fact, the American Pit Bull, yes that is the real name, was bred to specifically take care of young children. Specifically. But it will do anything to please a person with a mental shorty, and there are enough of those kinds of people around.
40 years ago, you never heard of a Pit biting anyone because it hadn't become the fad to use them as compensation tools.
You want to know the dog who really has the most agressive behaviour toward anything? That would be a Jack Russell. I have one, and she easily dominates males twice her size. She was a rescue and she bit my wife right through the hand when we first got her. Over a period of 2 weeks, I had to forcefully pin her down 4 times. She is not human agressive anymore, toward anybody.