The issue is that it is the owner not the dog.
It is the owner who choose to breed and buy these dogs.
It is the owner who chooses to keep potentially dangerous animals around children
It is the owner who keeps them confined, doesn't exercise and doesn't train them
It is the owner who keeps them unmuzzled
It is the owner who likes a dangerous dog as a status symbol
and so on...
(yes I'm aware that some owners are highly responsible, but lets be real most normal people don't want to own a potential killing machine, they go for a cockapoo or a labrador)
And the wider societal issue is how on earth do we police these owners when the ones owning the dogs that attack probably don't give two hoots about the law, probably keep their dog inside / in their yard most of the time, probably terrify their neighbours who wouldn't dare complain for fear of being targeted, probably have mates who have similar aggressive dogs, probably live on sink estates where drugs, child abuse, child neglect and other crimes are a police and slocial worker priority not checking on dog breeds.
It's easy to say 'lets ban all xl bullies' but that is just going to be a green light for the type of person who owns them- they'll become a bigger status symbol, be hidden away more and not get exercise making them more aggressive and so on. We have massive anti social behaviour in this country that is what is terrifying. I'm sure there's some areas and estates police just avoid as it's too much hassle and nothing will ever change.