Neither the SBT nor the APBT nor the Amstaff - are supposed to be aggressive to humans.
Not like some other breeds that are (were) supposed to be protective of their personal humans and aggressive to outsiders.
How's this for an aggressive breed...
on the NSW stats - they're right up there with the SBT. Mostly in proportion to ownership levels. The more people that own one, the more chance of owners that are no good at reading or training a dog.
Dog Whisperer: Showdown with Holly - YouTube