The police were called because the passenger refused to leave. The pax doesn't have some absolute right to remain on private property. Thisis UA's property, if you're booted out of someone's business and refuse, do you honestly think management is just going to say, ok, you can stay.
Yes. I can envisage a sensible solution where you do just that and look for another solution. Sometimes the "red mist" or " I must show you who is the boss" is provoked to the forefront and the result deteriorates into something like this. There are times when you lose the battle to win the war. In a customer focused business this often happens.