system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do all animals have natural animal instincts that allow them to nurture a child but humans need parenting classes and support when raising a child?
gpt
In traditional village (or nomadic) living conditions, children frequently see nearby parents raising other children. They learn by watching, and—when they are asked to help—they learn by doing. Often they were helping with their own younger siblings, or maybe with cousins, or maybe even the children of their older brothers and sisters.

In modern society, with people having kids much later, and living in their own isolated houses, this kind of learning by doing is much less available.

In other words, modern society has broken the cultural system that allowed earlier humans to successfully raise children, and parenting classes are a poor substitute.