Nobody is saying that not sending kids to school could be not-net-negative economically in some specific cases (eg. when someone is anyway at home not doing much, maybe in farms still nowadays?). Such cases represent a tiny minority of current population, at lest in Europe (and in all rich countries). And, even for these small percentage of cases, not being net negative economically is still far away from dramatically raising the economic cost of raising these kids (even if tuition is zero).
Nobody is saying that not sending kids to school could be not-net-negative economically in some specific cases (eg. when someone is anyway at home not doing much, maybe in farms still nowadays?). Such cases represent a tiny minority of current population, at lest in Europe (and in all rich countries). And, even for these small percentage of cases, not being net negative economically is still far away from dramatically raising the economic cost of raising these kids (even if tuition is zero).