Well, we definitely have to forbid cars, voting, sex and alcohol, then. Hmmm... that used to be the case. It was called “In Loco Parentis” or some-such Latin phrase. It went out the window when we passed the Constitutional amendment making 18 year olds full citizens.
Repeal that amendment, and you might find some sympathizers.
Why would you make the assumption someone is incapable of safekeeping a weapon with out oversight and rules from someone like yourself