First of all the nickname for a staffy and a pitbull terrier is THE NURSE MAID DOG OR NANNY DOG. They sure the heck didn't get it because they are not good with kids!! I have worked with some of the meanest pitubulls who with proper training, affection, and time have gone to great homes and every single one are still in there homes, all 36. Almost half are in homes with children.
Any dog can be mean, it all depends on the owner and the amount of time you spend to train the dog!