Your analysis is spot-on.

There is also the "zero-sum game" myth, insidiously promulgated. Supporting the ascension of groups other than your own will detract from your well-being. Sad and far from true.

On American myths, this is worth reading: "Myths America Lives By:..." - Richard T. Hughes. https://www.jstor.org/stable/10.5406/j.ctv65sz08

And my own two cents: https://medium.com/politically-speaking/a-simple-test-for-racism-a54319d373ed