As an almost complete outsider with an opinion, surely realism would be the key point to focus on rather than a weird and wonderful interesting situation.
Sticking my neck out, and based on my experience on the ground, I would say the people management issues are fairly straight cut (and therefore perhaps not quite so challenging?) If the safety of the aircraft and passenges does not appear to be compromised, say a drunk pax who is perhaps a bit loud but otherwise behaving themselves, then they can be met by police on arrival at the scheduled arrival point. If safety is compromised or you think it may become that way, divert.
I'm guess I'm trying to say that no matter what the actual problem is, when related to the persons on board you will know whether its in the best interest to carry on or divert.
I'm not trying to simplify the guys' and gals' decisions, just trying to give an insight from a ground persons point of view that often sorts out the 'police/paramedics/animal control on arrival' bit. (The animal control one was thought to be a small dog in the hold. It was subsequently found to be a large spider. Unfortunately, after the hold was fumigated, the body of said spider was not found.)
How about a stark naked pax that refuses to come out of the toilet.... that would be based on fact too by the way....