I was not defending anything, just explaining. I think pre-school is probably there to prepare a child to enter kindergarten. After the third grade, apparently tbe difference in academics between those children who did and did not attend pre-school is negligible. I believe the point being made is that if a child does not attend pre-school that does not meen the child is destined to be academically challenged for their entire education and end up with a poor paying job and/or a miserable life.
(Can you tell if I did or did not attend pre-school?)