I think as a society we need a massive rethink on where dogs stand in the culture. At the moment, a lot of people consider them as important as children, or other humans. I think people think "my dog needs to run/be off lead/be free" or see it as a status symbol and not a weapon that needs to be trained, controlled and something that is actually a serious responsibility, as serious as driving a car (and look at how the standard of driving has fallen...).
It's all about individualism - I want this dog. Rather than, am I the right person to own such a powerful dog, am I prepared to do the necessary to keep everyone around me safe from the dog, and keep the dog from being a risk?
No one gives a shit. And so this will continue, sadly, if not get a lot worse.