Individualism is a very weak and defenceless evolutionary strategy.
Imagine there are two populations with the same distribution of competence. Population A is individualistic and colourblind, population B is ethnocentric and has in-group preference for other members of population B.
If A and B are competing for jobs and resources in the same society then over time members of population B will come to occupy most of the positions of power because even though the two populations have the same average competence, whenever A and B are both applying for a job or promotion, the A members on the hiring comittee will give fair ratings to both A applicants and B applicants, while the B members on the hiring comittee will give fair ratings to A applicants but better-than-fair ratings to B applicants. So over time B applicants will occupy more and more senior, powerful positions and be able to influence society to benefit the B group.
So being individualist and extending colourblind , fair treatment to all populations when other populations are ethnocentric and don't return the favour is just letting yourself getting taken advantage of like a chump.
As it happens, white people are the group who are the most colourblind and individualist, and we can see that they are indeed being taken advantage of.
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https://www.ljzigerell.com/?p=9002