I cannot believe pilot suicide is still being discussed. The pilots loved flying. The old guy had a sim in his house and the young dude loved banging all the women that came with being a pilot. There is a 0% chance this was pilot suicide. People are only saying that because they know it happened on SilkAir, EgyptAir and they (racistly) associate Malaysian Airlines with the same kind of 3rd world nonsense. It's not anywhere near true or probable.
The "most reasonable" thing is clearly some sort of pilot trained terrorist hijacked the plane; or the current pilots were paid off, or some other force or thing took control of the plane; and it was flown to a remote, predestined location, such as the Sino-Kyrgyz border. Speculating on a reason is fruitless atm, but that's likely what *happened.*
Neither SilkAir 185 or EgyptAir 990 "flew around for 7 hours before suiciding because of a disturbed mental state." They did it as soon as they could. Watch "
The Bridge" for more insight on how and why people commit suicide. You don't "fly around a plane for 7 hours" when you want to commit suicide. You plan it for years and then just do it.