NSF - you are right, the baggage handlers were noted to be using brute force to close the DC10 cargo door. HOWEVER - the whole point was that when they did this, the door appeared to be safe - the vent door closed and the warning lights went out.
A well designed door may still have yielded to brute force, but SHOULD NEVER yield in such a way that it indicated it was safe when it was not. That was the bad design.
As I said - blame the designer for a bad door, not a baggage handler for screwing up when using a badly designed door....
TA