I am now of the opinion that it was most probably a bungled Hijack, carried out by someone with the knowledge on how to disable the captain, killing him first, after his last good bye call to the control tower, and the hijacker then disabled the electrics, like pulling out circuit breakers, to disable the transponders, did we not hear that one of the co-pilots was not asked to fly, yet he turned up for the flight, and a woman who made a 2 minute call to the pilot shortly before taking off, seems very odd why someone should call the captian from a mobile phone that is not registered, or someting else, and that phone sim card cannot be traced to anyone as it was pay as you go card.
I am wondering if their plan was similar in nature to 9/11 but tragetting the Malaysian Petrona towers, hence the reason for their westward turn after leaving Malaysian Air Space when they said final good bye and Good Night, may be their plan was to go west and then reapproach from south west to hit the Petrona Towers.
But a fight may have broken on board killing the pilot and then possibly passengers killing the Hijacker, and may be one or two other crew members, which meant that the plan carried on flying south and crashed when its fuel ran out.
And because all communications were cut off by the hijacker, by turning off transponders and other means of communications, no one else on board knew how to restore the communications or the transponder circuits and no one could therefore pilot the plane, or send any SOS mesages, the plane continued on its southward path and crashed when it ran out of fuel.
Because of this bungled hijack, no group wanted to own the responsibility to own up to a embarrassement, or the Hijackers were working alone.