I think things like this always comes back to the parents / guardians because kids will always find away to circumvent these rules whether it is fake ID's, sneaking into theaters, watching the movies online pirated and even using credit cards to purchase tickets online to these movies they aren't allowed to be watching in the first place due to age restrictions. The parents ends up being the ultimate police in the end which just makes the social responsibility of the theaters sort of a formality than anything else.