Cityfan
I think you need to have a read of what little we know went on here. No one, or not many, are questioning the captains authority to divert but more his reasons for doing so, as MU3001A also stated.
Insurrection, are you actually serious about this? Pitch forks at the flight deck door and all that? He landed and off loaded the purser, no one else and then carried on. If there had been a full scale mutiny happening don't you think one or two others might also have been asked to stay in MIA.
Your ill thought out hypothesis has not helped in trying to give the captain on that flight a break.