Minds which lack training for fact-based logical reasoning and the scientific method cannot possibly reach their full human potential and are often at the mercy of panderers, political and religious. They reside somewhere in the middle of the spectrum from fully-realized adult human to brain-dead zombie. That does not make them worthless, but each one represents a missed opportunity for a fuller comprehension of the true nature of the universe and maximal contribution to the human endeavor.
When parents prevent their child from being exposed to certain facts and techniques for rational thought, they are purposefully stunting their child's intellectual capacity in order preserve faith-based doctrine. They cripple their child's intellectual potential in the name of moral principles lacking a solid foundation in fact or reason.
If this sounds like the Rick Santorum family story, it's because Panderbear had them in mind when he wrote this post. Santorum's homeschooling of his children to prevent their exposure to morally subversive knowledge is not just a tragedy, it's a crime against a self-aware universe. How can our children surpass us if we teach them what to think, rather than how to think?