http://www.chicagomag.com/city-life/April-2017/3-Things-to-K...
tldr: They're rent-a-cops hired by the airport, not United.
However, this is Chicago. Locals know to never assume anything about city government because you'll tend to discover the opposite later on.
Having lived in Chicago before, you fear the Chicago Police and your local alderman is the fixer.
If you're the mayor and you want to close an airport, do you follow FAA procedure and give notice to the government and all the aircraft owners (especially the ones with planes parked on the tarmac)?
Nope! You shut it down in the middle of the night and bulldoze the runway. Problem solved!
https://www.aopa.org/news-and-media/all-news/2003/march/31/m...
http://www.airspacemag.com/flight-today/day-shut-down-meigs-...
[1] http://www.chicagotribune.com/news/local/politics/ct-united-...
The the officers screwed up the extraction, but the guy was ridiculous.
Did he actually believe wailing like a 2 year old and doing his damnedest to hold on to his chair would result in his remaining on the flight?
His face injuries were caused when he finally lost his grip on his seat. The effort of the guy extracting him suddenly had no resistance and the guy sprang out across the aisle and whacked his face hard on the aisle arm rest opposite him.
The whole thing was a shitstorm where mistakes kept compounding, made by both parties.
Of course the whole thing was instigated by united and I firmly believe they were in the wrong, but the passenger was obnoxious and not free of blame.
They have both the training, tools and experience to deal with this.
I'm not sure what happened here - apparently the officers were "Chicago Aviation Police" - which is different to the "Chicago Police Department" (i.e. what you and I would know as real police officers). Surely there was somebody they could have escalated to (or simply called in the actual Police Department) if they thought it had to come to this?
Those police officers deserve praise for defusing the situation without escalating it. And at the same time, it also shows that yes, police can find ways to control situations without resorting to extreme violence. Even in this case on the airplane, I could easily imagine a competent officer saying to United, "is there any way you could convince someone else to give up their seat? Maybe offer more money?"
http://www.chicagotribune.com/news/ct-united-chicago-aviatio...