It wouldn't be a problem if parents didn't feed their children cancer. Kinda like banning smoking in public places. Thing is that most children eat whatever their parents give them that is sweet. Sweet sweet cancer.
Banning smoking in public areas is completely different. It's up to the smoker to know the risks and decide whether or not they want to smoke. However, it's not fair that their decision will affect other people negatively that don't like smoke.
Eating unhealthy, while obviously still a poor choice, doesn't effect anyone but the one eating the food. While most kids won't have the sense or discipline to eat healthy if the choice is left up to them, it's the parent's job to help them with this, not the government's.
EDIT: @iGuess, like I said, I realize most children won't make the right choice when it comes to healthy eating. But I still don't think it's the government's place to make decisions like this, at least to this extent. In cases of bad parents, then I fully support the government stepping in. But something like this is just cruel, in my eyes. Besides, it's not like parents can't still buy their kids the food. Taking toys away from kids just because they aren't eating right
isn't right.