Off loading passengers at the drop of a hat is not common practice. There are many reasons why a passenger is unfit to fly and that is the usual criteria applied when a pax is offloaded. Most people would be amazed at the range of behaviours demonstrated by pax and it is not always a simple solution. The OP stated that the pax calmed down for most of the flight. It would appear that the cabin crew did a great job and managed the situation in the cabin. They may not have even advised the PIC during the taxi out if they felt the situation was in hand.Certainly they would have been informed after departure and they were probably comfortable with what the CM had done. The CM was probably very experienced and had encountered similar situations many times before. I have never been disciplined for off-loading pax or for calling the AFP to meet the aircraft on arrival.