I think you are missing the point; a passenger that had paid his fare and was seated, had a right to expect, short of an emergency, that he would complete his journey. That his ticket was proof of a contract that existed between him and the airline. The airline was at fault for breaking that contract because of internal mismanagement. The airline should ensure that it has adequate seats to cover bookings and staff placement. Either way, we, as human beings, have a right not to be dragged along the floor by police, for a disagreement such as this. This is a sledghammer to crack a nut and should never apply in circumstances such as this.