Pitbulls do not release any magical pain inhibiting hormones - they like all dogs in fact, all of us, experience a rise in adrenaline and other stress hormones that adds to a fairly high pain threshold, which many dogs have been bred for (not just bull breed types, most working breeds have).
They also don't have any inherent 'inability to let go', they're just good at hanging on.
Banning 'fighting dogs' might sound like a great plan - but humans will absolutely try to create some sort of combative, macho 'tough' animal they can pit against another, no matter what you do. Hence cock fighting, fish fighting, horse fighting... all still exist.
It won't stop children being injured or killed by dogs though - none of the kids killed in the last 20 years has been killed by an actual pit fighting dog. Nor even by one bred from pit fighting dogs.
Educating people properly on how to handle, live with and train a dog might help - but we're still happily sitting down to watch idiots push dogs around on tv and label them 'best trainer in britain' - and theres no requirement for our TV channels to show actual safe, sensible, science based training to the masses, its just FINE to promote dangerous methods that increase the risk of dangerous behaviour in dogs, because 'it's entertainment'.
Educating children on how to behave around dogs, what owning a dog means, how to train a dog, how to buy a dog - all dressed up as the various subjects necessary for the curriculum of course (biology, psychology, economics, PSE, maths, geography.. so many subjects!). But again, the anti-dog brigade shout that that is ridiculous... I disagree, it won't change the current generation of dog buying/owning public but would influence the NEXT one..