The Royal Aeronautical Society is holding a conference on aircrew mental health and well-being on 9 May in London. The link here shows that there is a considerable problem that needs to be discussed and treated properly - no knee jerk reactions - but a serious investigation as to how to deal with this issue in a fair way:-
Royal Aeronautical Society | Insight Blog | Aircrew mental health and well-being: 2015 to 2040
Read the link and take note of the statistics!