Years ago now I spent a few years as the night auditor (and desk clerk) at a cheap motel in a city of about 40,000 people. I got to know, fairly well, every police officer on their third shift.
It seemed to me as though these guys were very genuinely interested in the safety and well-being of, for instance, little old ladies, families with young children, salesmen, etc.
They could be counted on absolutely and I still feel, to this day, what might be called affection for them because of it.
I also noticed that if a person showed up who might be viewed as "the enemy" (ie; gang types, hookers, junkies, etc) they could expect absolutely no mercy whatsoever from the police. And I remember a couple of incidents that I find sort of chilling. (Though these folks often did spend the night safely by keeping a pretty low profile.)
I suppose one difficulty for the cops involved was "separating the sheep from the goats" on a moment's notice. Not easy to do. Though there are some visual and "body language" clues one can use with some confidence.
I suppose they, and the rest of us, can only judge strangers by these clues they give out.
That woman on the video didn't seem to give out the normal "red flags". but our view was sort of distant. Maybe that cop saw something that we didn't.
But that video still looked bad, from this distance.