If schoolchildren drank regular soda and ate French fries and Pop-Tarts in MODERATION, then unregulated access to these things would be fine. Unfortunately, they increasingly do not, and that is why diabetes and obesity are becoming epidemic among children. Aspartame may or may not cause brain tumors when consumed in large quantities, but it is virtually guaranteed that regular megadoses of corn syrup and trans fats will do bad things for your heart, pancreas and teeth. Ideally, it should be parents' job to inculcate "moderation in all things" in their kids, but it's not the fault of school administrators if that's not happening. There's no way schools can force kids to consume soda and deep-fried foods in moderation if they have soda machines in the lobbies and McDonald's in the cafeteria. As I understand it, these kinds of measures are just schools' attempts to do what they can to at least not be part of the problem.
And honestly, I just don't get why anyone, particularly parents, would be opposed to safety measures like seatbelt laws, rubber swings, etc. Sure, there were plenty of folks who bounced freely around in their carseats in the old days and lived to tell the tale, but on the other hand there were plenty who went through the windshield, broke their necks and didn't. When my oldest son was a toddler, he fell off the monkey bars at school onto good old-fashioned blacktop, suffered a compound elbow fracture which severed his brachial artery, and almost bled to death before they could get him to the hospital. Had the ground below been covered with pea gravel or wood chips as the "gestapo" now require, his injuries would have been much less severe. I just don't get why anyone would oppose measures like this.
Fireworks? If you really have to have your Roman candles to feel festive, you can always find one of those truckstop fireworks superstores that will sell you those, and pretty much anything else, in return for signing a laughably unenforceable waiver. As for weapons in schools, frankly, knowing that they are indeed there, I would rather have security guards on hand who are trained to deal with them. And I don't see how baby boomers are to blame for these weapons being available, either.