roulishollandais,
what you say is not wrong, but the question WHY they crash is basically what all the accident investigations are about. And they have shifted from mere technicalities to also the stuff going on in the background.
In fact, I agree a 100% to:
The most important rule to respect is : "The Captain has the decision, he must stay free"
Design, Owner, Operator have to respect that most important rule. When we list the crashes, knowing or not knowing what happened, so many times the Captain was "missing"
And when the captain is an idiot, the F/O has to take responsibility.
In the end - IMHO - it boils down to personality of a pilot, a thing we canīt really measure (at least only to an extend) and we
certainly wonīt be able to get a clear opinion of what it takes to be a good pilot and a safe operation. Ask 5 pilots, get 6 opinions.
I donīt think I need 3 tonnes of manuals to fly safely, others do.
Thats just human.