While the cop is doing horrible and dangerous intimidation.
It also my makes no tactical sense. Unlike a revolver if he shoots his automatic pressing unto someone, he'll have to at least manipulate the slide manually if he needs to make follow-up shots. He'll probably need to clear a failure to eject and/or a failure to feed.
So in short another angry cop doing multiple stupid and dangerous things.
I've updated my comment to clarify they, it's the vehicle with the cannons they've kepted. Not much need for the radar against the Taliban air force.