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Almost all of the oppression we see around us can be explained by wealth disparities, corruption, and abuse of power. ... The Black Lives Matter movement was a telling example of this - police brutality is indeed an ongoing problem in society, but it doesn't just apply to black people. It's anyone the police feel they can get away with abusing. Just look at how they treat homeless people, drug addicts, and so on, regardless of race."
You're not wrong about that. But many people face further oppression based on their race, gender, and sexuality, in addition to wealth and class.