African American

... he was a small town top cop trying to be "perfect".

That sort of overreach will not fly.

But in big cities where it's understood there are going to be plenty of unsolved crimes, they improve the statistics a little.

There doesn't even have to be an explicit conspiracy, just have it understood that collars resulting in convictions are good for a cop's career.

And likewise the racism is often systemic rather than explicitly ideological. After all there are times when white people are framed by cops for various motives.

But when it's just a matter of improving one's statistics, so much easier to get away with doing it to blacks.