It should also be remembered that not all cultures are intent on making sure the blame is correctly placed. Some are intent in ensuring that blame is not placed on superiors, local nationals (when a foreigner may be a convenient scapegoat), etc.
I was involved in an investigation where several tourists were killed in a helicopter crash in foreign country. Despite strong evidence to the contrary which I produced, the board of enquiry concluded that the cause was one of the passengers shutting off the fuel...