And relating this to my last post. Regardless of previous experience by airlines, is it the serious contention here that you are less likely to have a violent confrontation when dealing with an otherwise peaceful contract dispute by calling the police than by not calling them?
And in this particular case, of the three alternative available to UA, 1) call the police, 2) ask another passenger to leave, or 3) deny boarding to your own employees, that alternative #1 is the one least likely to result in a violent confrontation? That seems an incorrect ordering of the probabilities of violence to me. I would judge that 1,2,3 is the order of decreasing likelihood of violent confrontation.