As I recall it was the Daily Telegraph who first raised the issue of junior doctors working hours. The 'fear' culture within the medical profession lay in promotion prospects. This was in the days before organisations sued individuals.
Eventually doctors hours were improved when it became politically unnaceptable to have safety critical medical staff working through night and day. However, there was a cost involved. Somehow, the work junior doctors did through the night had to parcelled off elsewhere in the NHS.
A crackdown on commercial pressure and pilot fatigue would incur a cost in a viciously competative industry. More importantly, if the pressure was off the licensed pilot the travelling public would be safer.