In this case, that is akin to suggesting that children of any age should be able to drive a car or carry a concealed weapon. After all, the law should only do something about it if and when they break the law, right?
The rights of youth are curtailed for good reason. Many centuries of experience in our culture has lead to this situation. It isn't some insidious police-state trying to take over the planet, it's responsible adults -- voters --proactively reining in kids who aren't being appropriately limited, for whatever reason, by their parents.
There is such a thing as unfettered liberty; it's called anarchy. The majority of US citizens don't want that.
In other words, "it takes a village" right? Obviously, we will continue to disagree.
But I still can't fathom why anyone would think they should or could have such choices over other people's kids. If a parent wants to let their kids see a late movie, a late concert, or just hang out in a Taco Bell parking lot that's their business, not yours.