If you were talking about the security theater around travel, as well as garbage like secret no-fly lists, I'd agree with you.
But requiring a boarding pass to get on a plane is no more ridiculous to a near-total majority of humans than requiring a ticket to watch a movie at a theater.
But sure, I guess I'll say "no, he doesn't". Now what?
ONE student forgot the next day (who was a "bad" kid but not actually a bad guy) and was allowed to apologize to the school for his forgetfulness over the PA to make amends. (I shared a class with him when he got called to the office, so I know he was embarrassed to have forgotten. It was bad for his carefully cultivated "bad boy" reputation to get caught out doing something this trivial.)
The difference between then and now is that since people were always interacting in person there was less tendency for people to become psychopath basement trolls who would willfully bully someone to the breaking point and beyond.
One, where the FAA investigators have a list of people's names and what seats they were assigned, the seats have numbers engraved on them, and if lap belts were in effect generally still contain at least a torso. Meaning getting everyone's various bits and pieces back to their loved ones is a gruesome jigsaw puzzle, but a solvable one.
The other possibility is that the FAA investigators get a list of names of people who were /probably/ on the plane, a large field strewn with "loose meat and offal", and absolutely no good starting point. Also, a gigantic lawsuit and a moon-sized chunk of bad press as loved ones get the wrong body parts, or too many body parts, or too few body parts.
(BTW, never explain this to anyone who is currently on a plane.)
If its my car, and i'm missing. Its my body. If its my car, and i'm at home, its my partner driving my car, or i knew who borrowed it.
Cars are tagged with a plate, and VIN and other details that make it easy to identify. Less people means easier to find wallets/phones/identifiers in a clean up action.
Remember that before 9/11 a flight ticket was just a physical ticket like any other. You'd buy it and could sell it forward or give it away to whoever and they could use it by just showing it. Nobody cared who it was, just that everyone boarding had a ticket.
No ID is checked at airport security. On airlines that aren't trying to use name change fees as a revenue stream, there's no ID check at the boarding gate either.