Apparently not Captain S. We were pretty sure that our colleague was "fixed", before he shot himself.
Just from that short and personal exposure with its nasty ending, despite all the help and apparent return to health, as well as contact with a former military colleague, who confirms that he also cracked under highly stressful military ops some 15 years ago, it would appear that the whole business is highly unpredictable.
My vote....psychological illness + pills = never, ever fly another transport aircraft again.