i think that's utter bull shit. given enough time and effort, even your own effort all knowledge comes. There is no reason to not teach these kids the fundamentals of how to learn and grow in this society. They do not have to be janitors or cooks unless they want to be. We can make freaking robots for that crap. They must have the basics so that they can learn on their own after school or their world will be very bleak indeed. I watched my own parents work day in and day out trying to make ends meat. By the time i graduated from highschool their bodies were wrecked, and aliments of other kinds were coming as well. this is not how we should be treating people in this society.
At some point those jobs won't be there anyways like i said above, the time is coming where we are going to have machines doing most of the manual labor, and perhaps most of the lower thinking jobs as well.