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Oppression would be quite impossible throughout history if people weren't willing to oppress their own kind to the benefit of others.
Even those arguing for loyalty to the in-group are rarely those who would themselves make any sacrifices for that group.
No what's far more common is that people change their perception (or have different perceptions) of who is "their own kind."
You can actually see this happening in real time in the US with the emerging concept of "Heritage Americans." It's a way for losers and crybabies to narrow the scope of who is "their own kind" without having to openly declare that they simply don't love their countrymen.
> losers and crybabies
Luckily, for now, at least, it appears to be your side that is losing and crying.
Isn't the opposite far more common? When oppression happens, it is typically people oppressing the out-group for the benefit of the in-group.
Those are people I know very well because I have been to so many parties, dinners, and other events with them. I've seen the same thing with people from India, China, Sri Lanka, etc. I'd assume that it's the normal condition of immigrants.