Indeed, lowca!
If airlines didn't cram as many people into such a confined space as they do, there'd be less of an evacuation problem. But the risk of having their carry-on bags stolen or lost means that people WILL try to take their belongings with them during an evacuation.
If airline baggage handlers took greater care and there was less theft at airports, perhaps people would be prepared to trust their belongings to the hold. But they won't at present - the number of 'aeroplane mountaineers' with their large backpacks is just ridiculous nowadays. Particularly on LoCo airlines which charge for hold luggage, as I saw when I was unfortunate enough to have to travel with one earlier this year. On arrival, queuing for passport control is bad enough, but many travellers will do anything to avoid waiting ages for their bags to be delivered at the carousel.