It doesn't even have to do with academics.
Much of school is guiding students to navigate social situations that cannot even occur at home. How does a boy properly adjust his behavior when interacting with girls, if he has no sisters at home?
How does a kid figure out how to act in a group of 25 other kids when they only have 1 sibling at home?
.
We have 5 year olds at school that have been told by their parents to always hit back in a physical altercation. The parent is guaranteeing that their child get in as much trouble as possible at an age that neither child can really injure each other. So to avoid that, a teacher has to expose the student to the idea that there are rules at home and different rules at school or the store or the beach or a library. Thanks to that parent, who's singular message seems to be "just start swingin'" in every threatened instance.
It's a joke.
Leaving it all on the parents is how you get 12 year olds that don't trust the police and inevitably get in horrible situations. It's how all of the bad -isms perpetuate through the generations.
Actually, that's brilliant. You're right. By having unprotected sex, people get the right to ruin the life they make.
I can't argue against that. I'm wrong.