> The older sibling should be old enough to know better.

This is exactly what I meant by my above comment: It’s like the pro-ID check commenters have become completely disconnected from how young people work.

Someone’s 18 year old sibling isn’t going to be stopped by “should know better”. They probably disagree with the law on principal and think it’s dumb, so they’re just helping out.

True, hence the culture shift is necessary.

But imagine if a locked device was treated like alcohol. Most kids get access to alcohol at some point despite it being illegal, often from older siblings, and rarely with legal consequences for the adult. But it's much less of an issue, because most kids don't get it consistently. Furthermore, "good" kids understand that it's bad, and even some "bad" kids understand that they must limit themselves.