Sadly Occam's Razor points, like in the case of MH370 and others before, towards another deliberate crash. The BBC asks Who, What, Why: How are cockpit doors locked? The embedded video makes it quite easy to understand...
The high level of security against an outside threat makes it impossible to enter if somebody inside the cockpit desires so. The risk of a deliberate crash, among other factors is likely greatly reduced by strict enforcement of the rule of two. In this case it seems that the co-pilot was alone for a many minutes with the door locked during which time the autopilot was manipulated into crashing.After 9/11, changes were made to the security of cockpits in an effort to make hijackings more difficult. According to the US Federal Aviation Authority, doors should typically be tough enough to withstand a grenade blast. They are usually left locked throughout the flight.
Wrapping it up there have been a considerable numbers of cases in the last twenty years in which the pilots are at least suspected to have crashed their plane deliberately. Terrorism has led to a extremely costly and very intrusive response around the world and especially in the USA. It surprises* me that at least in Europe the institutional reaction to suspected 'massacres-by-pilots' which might have gone a long way towards reducing that low threat much further while spending not even a fraction of the anti-terrorism costs was not stronger and smarter.
*There obviously some explanations coming into one's mind, but I wonder what others think.
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