Most of the cops I encounter on a daily basis are either polite or neutral to everyone around town and on the train (unless the passenger is homeless). Capitalism aside, regardless of how nice or funny or relatable they are to me, it doesn't change the fact that if I was murdered by their colleague just for fun, they would choose to stay silent instead of turning their partner in. The rare instances when cops do have a conscious, they either commit suicide or die in a training accident a few months later.