Interesting article by those professionals whose job it probably will be to assess us in the future.
Especially the following paragraphs point at the core problem, the inability to really test for later mental issues.
"EFPA and EAAP underline that psychological assessment and human factors training are among the elements that make aviation the safest form of transport around the world. Together with technical and operational measures they ensure that catastrophic events, like the crash of flight 4U 9525, are highly exceptional. Also, the selection of pilots in Germany, as conducted by DLR, meets the highest professional standards.
Psychological assessment before entry to flight training and before admission to active service by an airline can help to select pilots who are mentally and emotionally prepared for the work and who can handle stressors effectively.
However, it cannot forecast the life events and mental health problems occurring in the life of each individual pilot and the unique way he or she will cope with these."
But of course.
Looks like we are forgetting that pilots are human.
No human will ever be predictable 100% of the time. Never happened, never will be. If you want total and complete predictability all the time, every time, get a computer.