I know that, but as I said above a blanket ban on pets would be different. The fact is they have, quite unfairly in my opinion, selected breeds which they believe are innately violent, seemingly with no thought to the way in which the animal is brought up.
But the issue is that a number of those selected breeds
are more likely to be violent. It varies between individual dogs of course, but you can't forget that dogs are bred by people for certain traits, and that they can be genetically pre-disposed those traits and behaviours. Aggressiveness is a trait like any other.
Sadly people want dogs that are aggressive, large and powerful. It's often the usual big car/penis length compensation thing. I hate to break it to you, but the reason that Staffies are so popular with chavs is not because of their playful nature.
I agree with you that this isn't the dog's fault, but that isn't the issue.