Human evolution favors parents who spank.
Two children are spanked. One grows up believing that it's good parenting. The other grows up recognizing it as abuse.
Think about how each one views the world in general.
The one who supports spanking believes in the just world theory, in which bad things only happen to those who did something to deserve it. Since they don't see how cruel the world is, they have no objections to having children. In fact, they spent so long tolerating being oppressed and hoping to one day become the oppressor, that they now can't wait to have children and abuse them.
The one who opposes spanking can't even process how cruel the world is. They're overwhelmed by how parents can scar their children for life, come up with the stupidest justifications for it, and still receive support from others. They also see many other examples of cruel people with power receiving the utmost compassion while the vulnerable people who they terrorize are seen as deserving of it. They can't understand how people got this cruel, and they can't figure out how to convince people that cruelty is wrong. Because of how cruel this world is, they refuse to bring a child into this world.
So, what ends up happening is that those who support spanking reproduce while those who oppose spanking don't.








