Everybody wants to do right by their kids and raise them as best they can. And as has been so often pointed out, the little tykes don't come with ownership manuals! But what parents do have on their side is history: A continual chain of successful child-rearing that stretches back thousands of years.
It's when parents start to ignore history that things get complicated. You know, like the history of successful, safe vaccinations that can actually save kids' lives.