You don't think there can be organizational factors involved in a company that hands out prepared resignations to the involved crew members before the investigation has even started?
Sure the crew screwed up - The crew will always be the ones closest to the accident - but the key point is why did they screw up? - if this crew could make this mistake, it could happen to others too I am sure.
The only really dangerous types are those who believe that it could not happen to them.