As I have said before it is no longer appopriate in ''modern'' accident investigation to talk about main causes, primary causes or any thing of that ilk. There should just be a number of contributory causes and lessons can be learned from that.
Ideology that is unsustainable. Take the USAF B52 crash commanded by an experienced and very autocratic Captain. He who listens to no-one and kills people in turn must be accountable on an individual basis. Not suggesting for one minute that such analogy is appropriate to the subject of this particular thread.