Then let's handle it like we do race: the average cop is a bastard. This is not necessarily true of all individuals, but it's statistically predictive.
If we want to be analytical, what is the definition of bastard? Does the average cop have a net positive or negative impact? How many rude interactions are negated by preventing an auto theft ? How many unjustified beatings are Justified by locking up a serial rapist or killer?