I'm with Parabellum on this.
It is fatigue that is the problem. And no-one in authority (or, apparently, the unions) has the slightest interest in dealing with this.
I cant remember the reference but I remember reading about sim experiments showing pilot performance deterioration with fatigue is comparable to that of those who have been given a few drinks.
But, hey!. As the airport security fiasco shows us, it is much easier to appear to be doing something, even if it is a complete waste of time, than to address the real problems.