You are ignoring the externalities. We end up with an ignorant society that ultimately harms all of us. I hate to use a movie trope here, but we're barely a step above Idiocracy when it comes to the ability of the average American to function and make decisions. This ultimately becomes self destructive.
87% of kids attend public k-12, and secular and Catholic schools together make up the majority of private, so if we're barely a step above Idiocracy, it seems a bit silly to point at the "man rode the dinosaurs" people.
