It's like in The Matrix, it's not until you unplug yourself that you realize that the world is worse than it has ever been. Opportunities essentually don't exist at all.
Also the argument that "if they don't realize it, then it won't hurt them" doesn't apply because it will hurt them badly in the end. Once they reach a certain age and realize that they're wasted their entire lives on video games, star wars, star treck, lord of the rings, game of thrones, etc... It will hurt badly and they won't have any way to recover.