Of course. If even a single foreigner mixes with a population, that populations genetic, ethnic identity becomes entirely invalid, and using it as something to

Of course. If even a single foreigner mixes with a population, that populations genetic, ethnic identity becomes entirely invalid, and using it as something to unite around becomes illegitimate. After all, if a thing has fuzzy edges, that's the same as the thing not existing at all. Fortunately every other ethnicity will be equally rigorous on what they use as a basis for common identity, so there's no risk this approach leaves you atomized against a unified competitor.