The first accident where crew fatigue was recognised as a causal factor in the report was FEDEX at guantanomo bay. (Several years ago).
A friend told me that in a meeting with the 'safety department' of her airline, they were invited to offer their opinions as to the most likely cause of a hull loss. (To see if it concurred with their expert opinion).
All the usual candidates were voiced. Weather, ATC mis-communication, Maintenance, blah blah.
When she suggested fatigue as the no.1 cause, she was told that this was not an available 'option' as it was 'too political'.
So why have the meeting, and why have a 'safety dept.'?