Is it only these dogs mauling kids to death or leaving them in hospital?
I know a guy who's dog started growling at his partner, it was big German Shepherd, they had the dog for over a year from a pup and for some reason he just started doing this and with other family and kids around I suppose they just had to get rid. They brought it back to the breeder, who basically just said, he's not a dog that is wired to be a house pet and took him back and retrained him as a guard dog.
They were bred for a specific reason and genetic traits were deliberately kept. Certain violent fighting traits from pitbulls, the bite, hold and shake is said to have been bred in from terriers. Who use that tactic to when hunting and killing vermin.
From my reading on them they're also said to have a very low gene pool. Many of them are basically dumb inbreds prone to violent outbursts. I doubt the people who own them are much better.
This makes for interesting reading on them.
https://banthebullyxluk.wordpress.com/breed-genetics/
No idea why anyone would want one of those around their house or kids. You wouldn't have a dangerous violent half wit inbred human around your kids. So why the feck would you want a dangerous violent half wit dog near them.