Then the drug dealers, criminals of all distinction chose this particular breed to teach them to kill . (Any breed could have been chosen. What if they had chosen the Collie?? America's beloved Lassie!!) The methods used to do this were unspeakably horrible.
But there are many levels to this question, and the short answer is…no, because you can’t breed “aggression.” You can only teach it.
This is a breeding grouping that consists of several breeds, each of which have a different history. They essentially all came from a mixture of bulldogs and terriers (hence, “bull terrier”) but several lines have descended from that mix. To say that a Staffordshire bull terrier will have the same temperament as an American pit bull terrier is foolish, but in America, both will be called a pit bull and are subject to breed-specific legislation aimed at pit bulls. The reason this is important is because when some site puts together bite “statistics,” they are putting anywhere from 4–30+ breeds into one grouping, them comparing them collectively to individual breeds.