When the pax buy their ticket online, have a copy of more detailed emergency briefing printed with each ticket. That way, if they are really worried, they can self-brief at home...
So how many of them would read and study that at home? 5%? For a 0.01% chance of something going very wrong during a flight? Cost/benefit, people are lazy, they start caring only after they get in trouble. Even for a simple short briefing, even more for a long and detailed one.
