without knowing the facts here, I think a useful addition to the safety videos would be a simulation showing two scenarios:
1. Everyone delays to grab some hand luggage, and half of the passengers perish in fire;
2. everyone goes straight out without delay, and the fire consumes the cabin just as the last person exits.
This would make the point.
It would be interesting to set up both situations in a mock-up plane with volunteers and measure the difference in time taken to evacuate.