the NTSB is full of humans...humans make mistakes...we have our opinions based on years of whatever we have been doing
my opinion is the airbus 300 series is a piece of shirt
remember that the FAA certified the A300
it also certified the training program used by American Airlines
it also certified the copilot
if they made a mistake somewhere, they could have made a mistake anywhere.
some engineering types are so concerned with elegance in engineering that they forget real life