I have to say if I had been an FO on an aircraft, I would have seriously questioned the ability of a Captain to continue operating safely if he had got himself so wound up that he felt the need to divert to offload another crew member. It also seems incomprehensible to me that the airline allowed the Captain to continue operating- if there had been a incident on the subsequent flight caused by a seething Captain mulling over what had happened and the pending inquiry, I dread to think what the repercussions would have been for the airline!
I'm only a humble ATCO so you'll have to excuse me, but I have to say I find some of the opinions expressed by flight deck personnel on this thread shocking, to say the least.