Yeah, they do.
But they shouldn't be given free reign to beat people up for no reason, or break their stuff for no reason.
If you have a guy who's in his car, sat there, doing nothing and refusing. You try and talk to him.
If you think he's illegal, ask for his ID. If he refuses, you talk to him some more. Then if he refuses, you tell him, "okay, we're going to take you down to the police station".
This sort of thing should take more time than "get out the ******* car you ******* underling" "No" "Bang, I just broke you car, and oh look you're now on the floor" in three seconds.
That's not what the police in a FREE SOCIETY does.