I believe your motivation for meditation is one of the very strongest predictors of the outcomes of meditation. If your motivation is enlightenment, that will lead to more profound outcomes than if your motivation is stress-reduction or whatever metric you would want to maximize your well-being at a normal kind of level. And changing your motivation (authentically) is hard. It's wired into you. If you're not motivated to meditate for enlightenment, there are very few things that can do that for you. So where would you expect to cultivate such a motivation with greater efficiency? Schools. Children are under creation, they are impressionable, and they are not distracted by life, by having a job, a family to take care of, financial status, social status, etc. Even if you meditate consistently every day as an adult, even while aiming at these higher states (awakening, enlightenment), you might not want to give up your job, your family, your finances, to become enlightened, or to pursue these things more rigorously. You're attached to these things, authentically giving them up is not usually something you can do over night. That's the crux of the issue of an unenlightened society. Nobody wants to give up what they have. They want to cling to what is their current life, the status quo, what feels secure. Even if they know very intimately what the enlightened experience entails, they might not want to actually give (and give up) what it takes to get there. So to create an enlightened Earth, you must start with the soil, you must water it so that the plants grow, you must give the plants the right attention and tools to grow into the potential that you give them. Let the old plants do what they do until they wither away. That's just the state of nature at this point.