These dogs have been bred for generations to be aggressive and strong, because they needed to be to fulfil the role people wanted them to do - kill animals many times their size. The high prey drive and defensive nature was necessary.
You don't eliminate that with a bit of training and a cuddle. The same as you don't eliminate the need of a collie to herd or have a lot of exercise or a spaniel to search undergrowth and flush out small furries and birds, or a terrier to go down holes after rats & mice.
The difference is that a spaniel or a collie or a terrier will wreck your house looking for fulfilment, run off, dig holes in your garden, round everyone in sight up, and if they do turn they are physically capable of less damage because their breeding has made them optimal for the job humans wanted them to do, with no need for the size or strength that an animal designed to kill another animal many times it's size and weight needs.
Then because of the size, strength and aggression they have become attractive to some in society that operate by intimidation and threats, and that attitude is not tackled, so this continues.
I agree that XL bullies are dangerous and yes, I think that the stage we're now at, something drastic needs to happen to bring that under control, but without dealing with the underlying attitudes just as harshly, something else will take their place and we'll be back here again with another tool for those who use aggression to go about their lives. Take away their XL bullies and they'll just use something else to make everyone else's life a misery, because no matter how those types of people bleat they love the dog and it's their world, it's not about the dog at all, but their ego. That's just an emotional manipulation to try and get their own way.
@ZippyLimeSnake could you control your dog, absolutely, without a shadow of a doubt if it decided to attack someone? Or another animal? Because all dogs have the potential to do that, from my ancient terrier and cooperative spaniel right through to your XL bully, I know that physically I could restrain both of my dogs because I am stronger than they are, I doubt either of them would ever attack a human, however as they are dogs that's not an absolute, it never can be, regardless of breed. That's the issue here, an XL bully is stronger than the average human, regardless of any temperament or tendencies, that's just a biological fact. And that's what makes them more dangerous.