There's tons of friendly and well raised pitbulls. Y'all just never here about them because the news doesn't make scary stories about them. Yall have a negativity bias
Pit bulls are the single mostly likely breed to be involved in a bite incident. Over 22% of all bite incidents are pit bulls. Not only that, they are the single most likely breed to be involved in a fatal attack.
So they bite the most, and their attacks are most often the deadliest.
Those stats are a result of shitty reporting by cops who are likely to just list any breed they can't immediately give two fucks to confirm as a pit.
A rather famous incident quickly dropped off the radar once it turned out that the dog that attacked the victim was actually a golden retriever.
Not to mention how these stats are most of the time introduced as dogwhistles (ignore the pun) for similar mis/disinformation about black people since pits and pit mixes are frequently considered a "black people dog breed."
A lot of the same framing too, "they're too dangerous to be part of white society!", "all they know is how to be violent!", "they're a danger to white women and children!"
Speculation, but also no shit Sherlock if it is true, if a chihuahua bites you you can punt it across the room. You can’t do the same with a stocky pitbull.