…….then ignorance and incompetence can be all but ruled out.
I understand the ignorance part, but don't follow the incompetence bit?
The first fatigue related crash one the new FTL scheme is in force should result in the prosecution of those who wrote and backed it.
Sadly, likely to be very difficult to prove. It was suggested by AAIB many years ago that the B737 freighter crash in Coventry might well have had some contribution from fatigue. Speculation m'lud. Hearsay etc. In the case of the coach-driver caused crashes in 70's & 80's from Greece to UK the surviving pax saw the driver asleep. In came the regulations and oversight etc. To achieve the same cause & effect of rule change in our world will be very difficult. Money talks and there is a lot of it lined up against the pilots' arguments.