If people the world over just stopped to rationalise this thing with pit bulls having latent aggression, being more aggressive than other dog breeds etc, it's all BS. There is no conclusive scientific evidence/research to show that the dogs which fall under the breed of pit bull are any more aggression-prone than other breeds.
Their status as killer dogs that just snap is unwarranted, any dog that is brought up badly and treated poorly will have behavioural issues and aggression towards humans, just so happens that pit bulls are in fashion at the moment largely in less desirable...