Not only do we today enjoy the benefit of accumulated cultural changes that discourage racism, sexism, etc, our wealth and power in America also affords us the

Not only do we today enjoy the benefit of accumulated cultural changes that discourage racism, sexism, etc, our wealth and power in America also affords us the opportunity to obviate the signals and impulses underlying those -isms that likely originate from the the set of tribal, insider-outsider stranger-danger impulses that were likely conserved because it increased survival odds in worse times. It is not chance that the more desperate is a community, the more that community looks to strengthen those impulses.