I find these sort of threads so irritating.
The fact is, ANY dog has the potential to be dangerous. They are animals, not little people in fluffy coats.
A tiny jack russel could maul and kill a small baby or child just as easily as a pitbull, rottweiler, akita whatever.
They use pit bulls as therapy dogs in America so they're not that bloody dangerous and if you look at the dog attack statistics, retrievers and spaniels are repeatedly responsible for most child dog bite hospitalisations.
The problem is (usually) silly people not training their dogs properly/actively encouraging them to be aggressive like the gang type owners/leaving them alone with children/allowing the children to pull their ears, tail, generally annoy them etc.
And of course you might just get a freak of nature attack with no apparent cause.
If your going to stereotype an entire breed and by the way, there is NO such thing as a 'pitbull' breed. Its not registered anywhere. Its basically any dog that looks like a big staffy you might as well just ban ALL dogs full stop because they all have the potential to cause injury.