Because the purpose of school isn't to teach technical skills, it's to indoctrinate the next generation. Dumb kids have to buy into the prevailing cultural myt

Because the purpose of school isn't to teach technical skills, it's to indoctrinate the next generation. Dumb kids have to buy into the prevailing cultural mythos also just as much as smart kids do, or society will crumble. It so happens that part of the cultural mythos in America today is that schools _aren't_ supposed to indoctrinate anyone, but that's beside the point.