Seems to me that this is partly due to a lack of legislation when it comes to sick employees. I live in the Netherlands and if a employee gets sick a company has to keep paying their salaries for up to two years and help the employee re-enter the work place. Only after two years they can be fired, but then they get sickness benefits from the government.

Granted, this wouldn’t overcome all obstacles and I can imagine pilots would still be hesitant to come forward. And companies might be hesitant to hire employees with a history of mental health issues.