It has been discussed in round about terms since very early in the thread. I suspect many people have reached similar points of view but you need to focus on the specifics without going into the geopolitical aspects or you get moderated tout suite.
The main objection I have is incapacitating the passengers to a point where no attempt is made over the next 6 hours to regain control. Which logically should have resulted in either a crash well before 08:11 or a diversion towards the West Australian coastline...
People have suggested hypoxia/ hypothermia but having just reread the Helios crash report where the FA with the CPL was seen entering the cockpit 1 ~ 2 hours after the loss of communications, I am still not 100% sold