There is no easy / correct decision
Much as you won't like it
and commander was again informed 3 times that we were not happy to continue and wanted to get down
would lilkely have been the least of his concerns
His priority was the safety of the aircraft and occupants, and an unplanned, short notice diversion requires a significant safety hazard to these to justify. 8 hours across the Atlantic is one thing, an hour to planned dest with a Cabin Crew and/or Pax to try to restrain further problems might be the best option.
Also, bear in mind the effect on your dispruptive Pax of being told the aircraft will be diverting because of them, to have them offloaded / arrested / locked up. Not guaranteed to calm them down
The fact that you got to Dest without futher problems somewhat (but not necessarily) supports the Capt's decision
sorry
NoD