Shouldn't your same argument apply to the "under 18 crowd"? Why is it a "nanny state" to force adults to wear helmets but not children and teenagers? Alternat

Shouldn't your same argument apply to the "under 18 crowd"? Why is it a "nanny state" to force adults to wear helmets but not children and teenagers? Alternatively, shouldn't grown adults be able to make their own decisions about whether their children wear helmets?