See imo, this is the problem, people like this just taking over society and making other people's lives a misery and they seem relatively unchecked. These dogs are just a symptom really.
I live near an area where the 'hard man' attitude prevails unfortunately, it's a deprived area for sure, crime is high and barely responded to, it's the same people, the same families who are stealing cars, or driving around without insurance like idiots and crashing into other people, driving while under the influence of God knows what and while already banned for driving under the influence of God knows what, taking what they want and threatening anyone who gets in their way - and these dogs are now a symbol of that type of person, because they're huge, strong and have a propensity to be aggressive (if you think that they were bred originally to take down bulls who can weigh up to a ton and have muscle on muscle, they had to be to do that!)
We as humans bred them to be like that and now they're in the hands of some of the most irresponsible and anti social people, who don't care about the dog, they want the fear and status symbol it provides, so instead of breeding out the characteristics that make them dangerous and unpredictable, they're being bred in.
It's a human made and human perpetuated problem. We can ban the breed, we can destroy and remove the dogs, we can stop any more being bred and let the breed die out, and that will stop these types of dogs killing and maiming people, but until we tackle the type of people that are using these dogs in this way, another method to be anti social and dangerous will take it's place and the cycle will start again. These dogs are a target for these people because of their breed.
That's not to say that I think the ban shouldn't be happening, it absolutely should, we can't carry on with these dogs behaving like this, and responsible owners of these breeds need to recognise that as well, they are responsible and neuter/train/muzzle their dogs but they do need to accept that this type of dog attracts the type of people who don't. I am seeing a lot of "I hate this government" and "It's not fair" posts from owners who have complied and who are responsible owners, and no it's not fair I agree with that, but that doesn't mean something doesn't need to be done either.