“Why would evolutionary theory over-ride cultural theory?”
Perhaps for the same reason physics tends to override chemistry which tends to override biology? People have sex, people produce children, and people drop dead, and culture can’t do anything about it or its evolutionary consequences.
Evolutionary theory and cultural theory may be explaining different things in differing ways, but you can’t get around the fundamental law of heredity: if your parents didn’t have any children, you aren’t going to have any children.
