Race mixing I'm fine with, so long as both parties are mentally stable, the male remains dominant coming from the comparatively superior performing society, and the female is supportive, willing to cut all ties to all but the life reaffirming aspects of her culture. Technology being what it is, you can build an extensive library of media to entertain your family for years and ensure they're only exposed to the best and most nurturing your culture has produced. You can also screen out the people you associate with who subscribe to the ideologies that would poison your children before such a time as they're mentally strong enough to defend the beliefs you've instilled in them.
If the females of your tribe aren't interested in engaging in exclusive pair bonding in the hopes of becoming a wife and mother, ostracize them from your life completely, even the ones related to you. They are mentally ill and mental illness can spread just as virulently as any disease causing virus or bacteria.
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