Well, I’ve never heard that they were bred for guarding...Not in the way Mastiffs or Dobermans were; that doesn’t mean that no individual dog was ever used for the purpose, but I don’t believe that the breed was developed to bring down men as, say, the Mastiffs were.
Many, many pitbulls are human aggressive, but I imagine that has more to do with clueless, incompetent owners allowing their dogs to stew in their own boredom and bad behaviors, rather than an ingrained trait.
To me that is the delusional mindset that far too many Pit Bull owners have bought into.
To me it is analogous to saying “My kids have been raised around guns their entire life, so there is no need to observe safety precautions.”
Any dog can bite. Even if we assume every dog is equally likely to go into a biting attack, a rational person must weigh the disparate consequences of each.
When Gangbangers select dogs for their capacity to guard meth labs they are breeding them for guarding. Non human aggressive Pit Bulls are selected against among far too many backyard breeders who WANT a dog that scares people.
One of the reasons a “breed ban” is so short sighted. Almost any dog breed can be selectively bred to be larger and more aggressive - and the Pit Bull has been selectively bred to be human aggressive.
“Many many pit bulls are human aggressive” you said, and despite your caveat, that is reality no matter how competent the owner is.