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Strangers may not have been the best choice of word, but what I meant is that how people who were in more or less outgroups were treated wasn't so much a matter of public policy. They might be accepted. They might be murdered sporadically. There was no affirmative action, no Jim Crow laws. There were pogroms, but no holocaust.
So, basically, that people-not-from-my-tribe should not be "outlaws" (in the original sense of "outside of the law")? Essentially, you are talking about the idea of law which covers everyone regardless of who/what they are?