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I didn't read GP is underestimating racism, but as sharing your goal but disagreeing with the means. The problem with the race-focussed approach to end racism is you can't change race.

But most racist problems actually manifest themselves as socioeconomic problems. And you can tackle those. And when doing so you can even gain allies, because poverty, bad schools and so on affect people regardless of skin color, which means fighting for better schools, higher wages etc. unites people regardless of skin color.