Humans evolved in an environment that is completely unlike the world in which we live today and a lot of things that people do intuitively might be actively har

Humans evolved in an environment that is completely unlike the world in which we live today and a lot of things that people do intuitively might be actively harmful. That's true for lots of things, not just parenting. Your instincts are not enough to successfully navigate human society as it exists today. Aside from that parenting for as long as we have been around has been something that was taught -- from your own family, if nothing else. The evidence of that is the experience of literally every single person who has had children who have family members tell them that everything they are doing is wrong.