It's about class because there are black cops and white arrestees?
There are numerous problems with policing in this country - some stemming from class, some from race, and some from a cruel intersection of both. Or, usually, even more factors. You can't just boil everything down to "It's class" even if class is an important component of many social problems we face.
I get where you're coming from, but especially in America race is often used as a shorthand for poor, as well as being straight up discriminated against due to literal racism.
It annoys me that corpos and politicians only focus on the aspects that don't affect their bottom line. They're quite happy to have a pride flag or a black square, but never in a million years are they going to engage with socio-economic class.
It almost feels like a divide and conquer style conspiracy to keep the lower classes fighting amongst themselves
I think it's much more complicated than that. It's about culture, poverty, the desire for order, the subjective nature of justice, mental health, inequality, tribalism, public safety, addiction, trauma, human nature, power hierarchies, narcissism and sociopathy, fear, mistrust, anger, and so on and so forth.
Skin color can function very well as a class marker, like a uniform that can't be taken off. Think of it as "low-tech" classism. The high tech version is, for example, the one conservatives project about: