It was a cold calculated case of murder.
Any diagnosis has to fit the facts. There have been cases of door malfunction before. Is there a motive or suspicion with this man - not so far. Seems A1. That's a big problem.
You are saying an ordinary person is going to kill himself and 150 people whilst on £68k and achieving his lifetime dream of flying, all while "breathing normally".
That does not fit.
We seem to be living in a period of unprecedented unexplained plane crashes. Is there a reason for this ?