Yes, the 1985 Manchester British Airtours disaster has indicated that some died when they shouldn't have done so, some survived when the circumstances were against them. There is circumstantial evidence that those who listened to the safety briefing were more likely to survive. More generally, from organisations like Solenis, 3M, Caterpillar, Raytheon - these are companies where repetition and reinforcement of safety messages make them safer companies to work for, and do business with, compared to their competitors. Incidentally, it's not just about you: you may feel able to make informed judgements about risk, but if you make a mistake about that, your friends, family, acquaintances are the ones who suffer. You may also have a role to play in helping others in an emergency, being injured yourself isn't a good start point.