Watch the video. The account you write is not quite accurate.
I watched the video. The cop knew perfectly well what he was doing - which was being arrogant, threatening, and disrespectful to a citizen over a trifle while the man's relative was dying. Including being threatening to the man's wife when she told him that her mother was dying in the hospital in whose lot the car was stopped. While at no time was the cop being threatened or even getting an attitude from the citizen.When the chief has to publicly apologize for your behavior - as well he should have - you are not exactly putting yourself on the fast track to promotion. At best, that cop is going to be on the least desirable assignments the chief can find until he quits. And rightly so.