Personally, I believe that A CAB. Yes, all cops are bastards, no exceptions. Yet I have met people who think that cops in socialist countries aren't bastards.
My reasoning is that it is a position of power over your fellow citizens/countrymen/people and only bastards would be attracted to such positions. While a person may go in with "good intentions", invariably they will be at some point in their career be expected to do something "not good": cover up for a colleague, arrest someone for law they don't agree with, beat somebody up, and so on. If they do it and remain a cop, well they are a bastard, no matter how many old ladies they help cross the street or whatever.
Let's also not pretend that a full communist utopia where every single law/regulation/rule is fair is possible in our lifetimes (or at all likely), there'll always be people who will want to abuse their power and take control, cops are an easily bought section of society that makes it possible for them. Historically, cops have always sided with the aristocracy/bourgeoisie/land-owners/those with money.
Your thoughts?
Back in the 90's (no idea how that would be now), at Cuba. police was formed mostly by people doing its military service (which was, at the time, 3 years).
Many of my highschool friends worked as proximity police because of that.
So no, not all C AB.
Said that, I would say that there are a ton of material and social conditions to ensures that, at least in a capitalist country, the role is fullfilled by Bs.