I found your thesis about the racist nature of police abuse interesting, especially how you tie it to mass surveillance.
I think you are probably right that this plays a large role in which communities and majorities will support or excuse this behavior.
I don't want to draw it too far, though. We should recognize that Muslim Americans get far more surveillance - more targeted surveillance - for merely being Muslim or having Muslim community respect. It's also true that people can and are fooled into believing and supporting principles, spurred by things like nationalism or political party identity, that actively harm or target their own minority groups.
This caveat I don't think invalidates your misgivings, which I think are good. If mass incarcernation and police abuse were as widely practiced on the wealthy or the majority there would be far more outcry.