Natural selection actually causes that. Babies that obviously look nothing like their fathers don't get to grow up and reproduce. So, bland babies are allowed to live and spread their bland-at-birth genes. Wait a few hundred millennia and you've got today's situation, even in a civilized world.
I'm talking about slight trends over millennia, most of which happened before tools were invented. I've been trying to dig up the article I read on the subject fifteen years ago but no luck so far; I'll ask some friends.
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