They are so used to being above the law that they are not giving any thought to the laws of physics or physiology.
EK521 and FZ981 weren't painful enough. In fact they are already making decent profits again. Unfortunately it will take bigger lessons to start their learning process.
As Brian wrote, Risk Management was involved in making the 3 crew long haul decisions. In their analysis there must have been a negligible uptick in the probability for an "event". What these numbers don't tell is the overall situation and how this may become the straw that broke the camel's back. That insight would require human intelligence by a qualified subject matter expert. But listening to their own pilots is out of the question. The organisation is deliberately set up for information to only flow from the top down. Their culture doesn't allow for the key recipe for success of information flow from bottom up.