Earlier quoted context omitted.
Why would there be a need to associate my ticket to my identity?
Just replying here in case it's more visible, but: - what if you're on a no-fly list? wanted criminals? - underage?
Catching wanted criminals would be nice, but that’s not considered sufficient justification in other places. Requiring an ID to enter the grocery store would help catch wanted criminals too, but few think that would be wise.
I don’t think kids flying when they shouldn’t be is an actual problem. You’d still need a ticket, which costs a substantial amount of money.