They may be told not to apologize as that admits fault and could invite legal action. Or they could just be made that way. No idea.
Slightly related because police, yesterday I was riding down Key Blvd with the notorious traffic-calming circles ahead that seem to make drivers oblivious to oncoming traffic. As I approached N. Danville, I passed an ACPD SUV with its window open, saw a car approaching the intersection (she had the stop and I had the right-of-way), and so as usual I was on alert. I needed to be since she blew the stop sign and I hit the brakes to avoid a collision. I heard the siren go and was satisfied to circle back and see her pulled over.
I suppose in retrospect I didn’t need to flip her off.