The policy is already clear, you are not guaranteed a seat on a plane, even if you are a doctor. You also have to follow instructions from the crew. If you don’t, security is called and if you again don’t follow orders, then you get hauled off the plane. Not sure what the controversy is.
Did you see the video? Did you see how horrified the eyewitnesses were? Your average juror is going to have the same reaction.
If I were these cops, I'd be lawyering up in anticipation of criminal charges.
"...the policy is clear..."
The controversy is because some people want to pretend that rules are God.
There would have been others on that plane who, for cash, would have given up their seat. But since the airline had rules to hide behind they didn’t go to the trouble. You are arguing about rules, I am arguing about common sense, common decency, good business practice, protecting a brand and proportionality.
Finally someone who gets it.