You're missing the point entirely. Imagine if people thought the same way about height as they do intelligence. Neurotic parents would waste all their time tryi

You're missing the point entirely. Imagine if people thought the same way about height as they do intelligence. Neurotic parents would waste all their time trying to make their children taller. The nightly news would be filled with segments on how X or Y impacts your child's height. Yet, none of this would do much to change outcomes, because height, though highly variable among siblings, is mostly genetic.