A chat about the history of (civil aviation) Human Factors and CRM today went thus:
In the beginning .... most accidents were put down to mechanical errors or failures and designers were challenged to improve the aircraft and make them more reliable and safer but, when they did and mechanical errors and failures could be disproved, pilot errors then came to into majority and became the main safety focus.
Being unable to redesign pilots, their behaviours and environments were looked at and the early ideas of HF and CRM were born.
Born, but not yet buried.