1. They can't figure out the lock?
2. Lots of reasons, mostly already covered. I can well believe that some people have enough problems flying without listening intently to "what to do when we crash". Since starting to read Pprune I've started paying more attention - as a courtesy to the crew, mostly. And in the hope that it will encourage others to do likewise.
3. Cos we would pay 10% more to have 10% more legroom?
4. "Do cheap airfares override survival instincts?" Even an airline with a bad safety record is probably still safer than driving to the airport.
5. "Why the rush to disembark?" Beats me. I stand up when the people in the aisle nearby start moving.
9. Greasers - some people really do think that you "slam it down" because you want to.