The fact remains he was in charge of the flight, and if he felt his authority was no longer respected and the chain of command was broken, then at 600mph, there is no time to discuss it. Whatever, he chose to terminate the flight. It sounds like he had a right little rebellion going on in the cabin! He obviously felt he could not continue under such an atmosphere. There was obviously a big build up to this.
I doubt it has all been settled yet. The crew should have stuck with their responsibility to respond to reasonable commands and act as a crew. I am sure the behaviour of the whole crew will come under the spotlight as well. It wasn't for you to make a decision on what you perceived to be a 'judgement call'. Your responsibility was to do your darn job! Nobody will come out well from this. So what drove it to that situation where the Captain felt the flight could not safely continue? What was going on- was there a state of war across the flight deck door? Who can fly safely like that? We have seen an accident in the UK killing many which is fairly certainly a result of a furious row and atmosphere on the flight deck.