I don't really feel any of those questions are particularly bizarre or inappropriate. From what I understand, this Stack Exchange is not just for professionals. As such, questions from those who are unfamiliar with aviation are worth careful, reasoned answers.
To address your points, one by one, because I feel that is appropriate to do so here:
- Passengers often wonder what they can do in the event of emergencies. In the case of some light airplanes, they often will have to wear a parachute.
- Did you read the answers? Why is this bizarre or inappropriate? Plenty of non-pilots have seen Airplane.
- As a pilot who went to an aeronautical university, and who has a great deal of understanding of the airline system, I am worried about pilots who have been drinking. It is not an invalid fear; airlines battle alcoholism among the ranks relatively often, and it causes incidents or accidents occasionally.
- If you had just discovered FlightAware, wouldn't you wonder why airplanes occasionally disappear?
- Are you suggesting that most airline travelers are not completely terrified of hurtling through the air, sitting in 30" pitch seats while approaching the speed of sound?
To summarize, I'm not sure there is anything that we can do other than downvote or flag questions that seem low quality. I'm also not sure that there is anything that we should do.