My point is that education and educating yourself are skills. They must be learned and modeled. If you have no one who teaches them to you or models them for you, you won’t know how to do it. It is the exceptional individual who can learn well without being taught or shown by anyone how to do it. Most people have teachers, which is part of why teaching, as a role, has been traditional for some people for thousands of years and we create institutions and groups to do this job.
A poor urban kid is unlikely to wake up one day and know how to teach himself a skill without anyone having shown him how or where to go to get the information. The data won’t just pop into his head unless he’s some genius inventing physics from first principles, for example.
Where do they get the tools to do this farming? Where do they get the seeds? Where do they get the knowledge of how to grow the food? You think these things magically appear?
Hell, where do they get the land in an urban environment? If you say “use land not being used,” what happens when the owner recognized by our legal system shows up and takes “their” land back?
You can’t really think urban poor are going to magically have farming skills, knowledge, tools, and seed and just take over land and it will all somehow work, can you?
Why don’t you go do urban subsistance farming for the next year. You can only eat what you grow outside the system! 1…2…3…Go! Let us know how it works out and if your first crop comes in before you starve in a few weeks.