If I were a cop, I think one group of people I would bend over backwards to maintain good relations with is the hospital ER staff. Duhhhhh, real brainiac move there, Officer Friendly.
A lot of cops are simply dickheads. Dickheads who get off on exerting authority over others. Her only "crime" was daring to contradict this prick. The whole profession has really burned a lot of bridges over the past 20 years or so. They cultivate this imperious attitude in their fraternity. The "Us vs. Them" thing is entirely of their creation.
Maybe that seems like a harsh assessment, so what do I base it on? Not so much the actions of this one cop, bad as they were. What I really took note of in the video is the fact that there appeared to be at least 3 or 4 other officers present, from what appeared to be multiple agencies. And did any of them attempt to deescalate things prior to him grabbing the nurse and dragging her out of the ER? Did any of them say "Hey let's just sit tight and wait for Sgt. so-and-so" or anything of the sort?
I'm just not impressed with the "bad apples making the rest look bad" defense anymore.