The problem is that advertising is insidiously effective. Most people don't think ads work on them, yet the results of ad campaigns demonstrate that's plainly false. And this is even more true for children who have extremely poor reasoning and logic abilities, and are going to be being targeted by ads specifically designed to exploit their instinctive impulses. This is unlikely to be a battle that parents can win.

I think this is vaguely akin to exposing your child to gambling and explaining the impulses/desires it creates so they don't get addicted to it. But that's just not how it works.