Fatigue? Call in sick, take a day off, take radar vectors whatever, no excuse for bad workmanship. It is the responsibilty of the Captain to ensure the safety of his pax and crew, flying fatigued, letting the FO fudge it, forget it..
shaun ryder, I did not say fatigue was "the" cause but
may be
A factor. This was not to meant in any way to make "excuses" for this incident but it is a fact that fatigue can affect judgement as well as skill.