You've answered with a profound question of your own Sid. I'm assuming my old dad in law meant just being able to read and write and have a secondary education. My view was he was saying that if everybody in the world was educated to this standard, there would be that much disagreement on various topics and decisions it would be virtually impossible to live by a code of law and order.
As said, viewed one way a deep question, viewed another way just a silly thought.