This is an incredible thread, first I think we are confusing behaving appropriate while sitting alone on a plane VS. a minor having the ability to save ones self and not contribute to others being injured or worse. I regretfully used the word tragedy, I should have used the word mishap, emergency, accident.....anything that would require folks to get off the plane in fashions other than what is normally used, slides, window exits, tailcone exits, add in the old engine fire and smoke in the cabin and that reasonable person you mentioned that might or might not have looked after your kid cannot be found, infact he is already on a bus to the termninal. I cannot tell a reasonable individual simply by looking at them, can you? i'm certainly not going to trust their decisions in knowing what is best for my child in an emergency. I would tend to agree with you that most folks would indeed help a child, but your not going to risk my childs safety on an assumption.
as for the questions you asked from me, we tend to fly about 4 times a year, and considering several 40+ year olds in my family have yet to fly I would consider that fairly frequently, as a dependant of a retired Air force father, aviation has always interested me, because of this I count rows to the nearest exit, actually look and listen to the safety announcements and frequently as questions. Interesting to me is after flying with our daughters I found out that FAA doesn't allow for more than 1 lap sitter in a row, because some aircraft that has 3 seats on one side, there are actually 4 masks that fall....I digress, as for the emergencies I frequently hear about, most recently the Hudson most successful crash? controlled water landing if you will. before that the dash 8 in Newark, France Air 230 airbus, before that a Continental 737 in Denver that skidded off the runway resulting in engine fire and fire in the cabin, and don't even get me started on overseas crashes and accidents.
As for the minors traveling across the country alone, I cannot fathom why we allow this. I did a quick search and found out that most airlines do not 100% take responsibility for the minor and infact very nearly treat them as if they were adults....scary stuff. Again are we believing that these minors in the event of an emergency can indeed save themselves? I hope not...using your reasoning, thousands of children walk across busy streets without getting hurt but I don't advocate it unsupervised...how about swimming? thousands of kids swim each year without killing themselves but i'm not willing to allow my children to swim unsupervised. I work in a very busy ER as a charge nurse and usually a dozen or so minors present to my ER with notes from parents asking us to treat them, seriously treat a medical condition of a minor with a note giving us permission? you have gotta be kidding me?, I think this is negligent in so many ways. never would I send a my kid to the ER without my wife or I and I certainly wouldn't stick them on a plane and send them cross country....yiiiikes
lastly, on the topic of is my kid safer while flying with her next to me as opposed to sitting even 1 row in front of me........absolutely, I put their mask on, I throw them out a window to a waiting life boat in the event of a water ditching, I check to see if their seatbelt is on. Is my kid safer now flying with me right beside her, more so than the minor flying alone. you bet! much safer than assuming that the airlines or a responsible stranger would remotely consider the safety of my child before his or her own safety....for me it's very hard to understand your position because it is in complete contrast to mine and nearly unfathomable to me to assume that someone would take responsibility for my child under duress and panic....wow