Interesting point exiting with hand luggage
While accepting Polysilane's point about the unacceptability of the pax walking away from the crash with hand baggage how on earth does he/she think the cabin crew could have stopped this - taking bags away from pax at the door would created (literally) an insurmountable problem for pax following behind - better just to let them take the bags - if only to get them out of the way!
Quite frankly (after 34 years as a professional pilot - B744 Captain at the end) if I were a passenger and had the opportunity to get all my important documents off I would do the same as well - similarly I would do (and have done) in both an earthquake and two hotel fires in the past.
The pain of trying to reconstruct your life in a foreign country if all your documention is gone doesn't bear thinking about - unless it is absolutely unavoidable!!