That’s definitely how right wing media portrays them. The reality is quite a lot more varied and nuanced. You should talk to some undergrads if you can! You may be surprised that things aren’t as you’ve been told.
Alternatively, if you subscribe to your police / sheriff department FB or Twitter feed or whatever they have, they will often post news about training their staff at such-and-such academy or training center. Looking those places up and reading about what they teach, exactly, can be very illuminating - "killology", for example.
And then there's the Fraternal Order of Police...