To get their foot in the door, everyone wants to protect school children right? They'll come back a few years later and push to expand it. e.g first they remove a single product from food (trans fat), then they start regulating how many fast food places can exist in a given area (somewhere in California, yes it's true) , then they dictate that corner store has to carry fruit and vegetables (California again).... 30 -40 years from now we all eating tofu. :P
Many of the laws that control our lives start out like simple and benign ones like this.