Cover up
I previously posted that I believed the Malaysians were hiding something. I assumed something so crazy happened that they think they can't tell but pressure from China would force them to communicate all they know.
Noticing the latest developments, I now believe, the only thing the Malaysians are trying to cover up is their own complete incompetence about what happened and that they have neither proper equipment, nor people, to do something as simple as tracking their own aircraft and speak more than 2 straight sentences in a press conference, without contradicting themselves. The truth would simply disclose that they are completely defenseless and clueless, about what is going on at their borders and in their airspace. Living in Malaysia, that is a scary thought, particularly that they have sighted that "UFO" north west of Penang.
As far as the missing flight is concerned, I truly hope the crash site is soon being confirmed, black boxes recovered and the reasons for all the tragic riddles being solved.