If you read the article from the Mail today it is really clear that the Plane did not crash into the sea. They are trying to claim that it was guided by the pilot. So, the original story was comped and they've had to come up with another angle. However, if he was trying to kill everyone surely he would have nose dived into the ocean. In short, the whole story is bollocks and they're petrified that Malaysia will spill all the secrets.
http://www.dailymail.co.uk/news/article-5729823/Pilot-accuses-Australian-government-complicit-mass-murder-MH370.html