Looks like yet another bully type breed. They've been bred to take down animals twice and three times their size, to do that they need to be strong, have a strong bite grip and be aggressive and tenacious. Treated badly, left to their own devices, untrained or those traits encouraged, it's not surprising that they attack people, and their size and strength mean they do a lot of damage even 'just' snapping at someone, and serious damage in a full attack.
Unfortunately that makes them attractive to those who want to look hard and intimidate people, they're not interested in the dog, they're interested in the reaction they think they get when they are in 'control' of such an animal (even though they're not) and the status of having one brings, and using the dog to get what they want from other people.
It's not just large dogs like bully breeds that are like this, but their size and strength make it so much worse when it happens, and their looks and reputation are what attracts the idiots who need an ego boost to own them in the first place.
I agree with others about owners being charged with injuries or worse that a dog causes, licencing and banning certain breeds - including anything with that breed mixed in. And I've got a spaniel and a JRT snoozing next to me at the moment, I'm a dog lover but these dogs are being turned into a menace by at best, ignorant people and at worst, people doing it intentionally.