There was a whole 'Dispatches' program made about carrying minimum fuel. Lots of anonymous shadowy pilot figures making pointed & disturbing claims. Even some 'out in the open' pilot figures laying the facts down. That was considered OK and in some cases applauded by by many that at long last some had the courage to tell the truth.
But with fatigue there is great reticence. Which is the more serious issue? Other industries, e.g. junior doctors, have stood up and fought their corner. Why has this topic been bar-room chat for 40 years and not open chat?