I mostly don't agree with this as I know too many cops. The racism is tricky- if the only X people you saw were criminals, without any balance on the positive side it can very easily get into some sort of loop. And lots of places are like that in the US, for a variety of reasons- the cops see the bad side of X, without a balance of neighbors and other helpful examples to counterbalance. They're part of the problem, but they're also caused by the problem.