The problem is this:
Stuck downroute with an air traffic delay or such like, your Capt. tells you that we will inevitably go into discretion. Flight deck and cabin crew alike just want to get home and cannot be ar**d with hotac.
What I am saying is that people are perfectly willing to work even when they are tired. Who would admit to their fatigue being a danger to aircraft safety? I wouldnt. So does that make me negligent?