If we review U.K. CAP 371, named The Avoidance of Fatigue In Aircrews, we will see in the first lines of the Foreword of that CAP the recognition of the importance of the Bader Report in flight time limitations. Yes, it was way back in 1950 that someone realized that fatigue is a contributory factor in aviation accidents.
It may seem incredible nowadays, but many airlines oppose to FDTL, not realizing that it costs too much more to have an accident with dead bodies being shown on television, and still push towards a no limitation scenario. Maybe an accountant made the numbers and came up to a death/cost ratio that it becomes preferable to pay for dead passengers than to have pilots correctly rested.