It just does seem to me as if, when the pilot concerned was presented with these figurative 'slices of cheese' at the start of the flight, it must have been blindingly obvious to an experienced hand like the CFI that this was a very bad idea indeed - even if the young pilot concerned couldn't see it. It doesn't sound as if I'm alone in this view.
I don't disagree with you at all. However the comments about the outbound flight are still irrelevant as it was nothing to do with the accident flight. There is a major difference between the morality of the CFI's actions by encouraging the flight. But there still has been no evidence that the return flight was outside the control of the crew.
There is way to much emotion and moral indignation being applied to this. Too many people emotionally raw trying to apportion blame.
The fact still stands that the crew were responsible for the flight and did not make the right decisions. The AIB report indicates the same conclusions. The ethical issues around other parties behavior does not change the facts.