The numbers look bad:

In 2021, there were four fatal dog attacks, two of which involved a bully XL. In 2022, there were 10 fatal attacks and six of them involved a bully XL. These huge animals, which can weigh more than 60kg (almost nine and half stone) were also involved in at least two of the five deaths recorded this year.

…

Given that there are an estimated 13m pet dogs in Britain, and only a few thousand American bully XLs, there have been calls to ban what looks like an uncontrollable breed.

I’m sure the owners quoted are able to give them all the training and exercise they need but clearly some aren’t or can’t or just get caught off-guard and, given the size of them, once they go at you, you’re in trouble.