btw, i think you guys are barking up the wrong tree with the how poorly a group of people were treated justification for opposition to having family (we should probably just say offspring, no one gives a crap what their aunts or grandfathers are doing) marry outside their group.
i think it's much more about how strongly held a given group identity is, and how divergent that group identity is from the mainstream societal identity. like i wouldn't judge an amish american negatively at all for strongly desiring that their offspring marry another amish american, whereas i would view negatively a black american who only wanted their offspring to marry another black american. but, obviously, that isn't because i think the amish have been treated more harshly in america than black americans.