Several studies have pointed out that fatigue (often called drowsiness) causes as many errors as being under the influence of alcohol. This should be pointed out to the roster managers in the airlines that appear to be using maximum hours limits as normal rostering hours.
If airlines will not allow their pilots to have a beer before duty, then they should show as much concern to flying tired which is now being shown to be as likely to cause errors.
Perhaps gate checks should include the crew's previous months rostering.
In this case the crew also were put into a difficult Human Factors position one that was pointed out in 1908 by Yerkes and Dodson
http://pe-arousal.********.com/2011/...-u-theory.html (mentioned earlier in the thread) they went from relatively high arousal on the approach to doing a routine go around albeit for just 2 minutes no doubt relaxing back a little to the arousal/boredom of the previous 2 hours holding, then all of a sudden everything starts to go pearshaped and they are at the other end of the arousal spectrum - in HF terms that is going direct from one error prone state to another. Fatigue and over/under arousal are almost guaranteed to lead to errors.