> The program went back to the same town and interviewed the same kids, now parents, to find out how they were raising their own children. Fascinatingly, they had all become strict parents who never let their kids out of their sight.

Just some kind of hypothesis based on personal observation: The children who were really untamed have a tendency not to become parents later on when grown up (I really don't want to try a shot in the dark for the reasons). Those who were "tamer among the wild" as children were tamed even more by society, procreated and are now strict parents.