"the police clearly faced no imminent danger"
That's not true. The police car was being pelted with projectiles. From the outside, it was clear that this was low-threat stuff: water bottles, cans, etc. But when you're inside a car, you don't see the projectiles, you hear the impacts. More important, these guys were amidst a mob. Mobs are the most dangerous creatures on the planet, because they provide anonymity for the sociopaths. Sure, most normal New Yorkers wouldn't think of doing anything more that tossing a water bottle at a police car, but how do the police inside the car know that there isn't a sociopath with a molotov cocktail in that mob? I ask you honestly to put yourself in their situation and decide whether you could keep your cool.
The other important point here is the actual damage inflicted. From what I saw in the video, it appeared that nobody was injured; people were knocked down but everybody seemed to get up and walk away without limping. It's hard to say, because the video is incomplete. Do you know if anybody ended up in the hospital with injuries from that event? If there were no injuries, then the incident does not deserve the inflammatory style of your writing.