Those are good examples.
Any number of livestock guardian breeds, working schutzhund breeds and estate guardian dogs are bred to be bigger, stronger and naturally far more protective than pit bulls.
They're all expensive and/or rare and good breeders turn away more people then they sell to.
Gameness is a dog dragging itself across a room to keep fighting with its leg torn off and its guts hanging out to keep fighting for no purpose other than funsies, it's unnatural and has been bred into them for centuries -
good example
Pitbulls are bred to be gladitorial entertainers with no sense of self preservation and incredible fight drives - they are too common and too many people have them without knowing what they own. Yeah pitbulls are cool but people are so ignorant of what they have most of the time
You combine this sort of breeding with things like
prey drift which the average pet owner has no understanding of and pitbulls being just way too common in general of course pitbulls kill the most people - like duh