As I posted on another thread, I believe he was afraid this would end his airline career and he could not take that. He loved flying and was, by all accounts, very enamored with his job.
The German police found torn up prescriptions and a doctors excuse for time off, including that very day.
He flipped out believing his career was over, so what better way to ‘go out in a blaze of glory’ to a flying career than to crash an airliner into a mountainside?............
I agree.
And he did not appear to have a great amount of self esteem that you would think he might have. Like he was “living a lie” knowing he would eventually be grounded.
And, he also was physically slight. Does that have anything to do with it?