I don’t think anyone is defending these guys because they are the Great QF. And other than headline grabber journos like BB and GT, not many have attempted to play the racial issue, by claiming Caucasians are better pilots. Some have rightly called into question training standards in certain countries, but that is not so much a racial issue as a corporate cultural issue. Also in those places where corruption and nepotism is accepted there should be serious concerns about standards. I have seen enough poor performing Caucasian pilots in my time to know that ability is not exclusive to any race.
When there is a major screw up, the old Swiss cheese thingie tells us that usually more than one factor was causal. Fatigue is often played down by the ATSB because they don’t have the science to quantify it, or perhaps are reluctant to cross the mighty Qantas.