Originally Posted by jdrtravel

This could very well be a mental health emergency. In other words, the cause for the diversion could be medical. In fact, unless a pax has become intoxicated and that is the reason for their loss of control, I would suspect that the vast majority of cases in which a pax is so disruptive as to cause a diversion could be very fairly classified as mental health emergencies.

I don't know the details of this particular case, so I'm not commenting on that. I'm just making the point that human behavior is more complex than you suggest and that mental health issues can lead to very real unanticipated (by the pax) medical emergencies.