It appears to me as though you are extrapolating the behavior of the black bears in your area to the entire range of the black bear. Having had numerous experiences with black bears from Alaska to Mexico and many points between I can assure you that there are regional differences in their behavior. A simple example is that black bears in your area hibernate; those in southern Arizona don't always. There is a lot of genotypic variation among populations of black bears and I would expect that behavioral differences would be part of this variation.