"Psychological testing within a pilot's medical was considered unworkable by the Industry, despite acceptance & implementation by JAL"
Hardly surprising, Japan have something of a record of pilot suicides.
"Yes, the video recorder mounting might be too weak to hang your self... But hanging self in flight is perfectly feasible - a passenger managed this, in a toilet. Pilots take toilet breaks too."
The problem is not the individual pilot, on a multi crew aircraft, committing suicide, it is when he decides to commit murder as well and take the passengers and the rest of the crew with him.