I am thinking of an old episode of Mad Men in which a little girl, watching election returns on the TV, asks her dad what the electoral college is, and he responds, "I don't think that's a conversation that's appropriate for children." You wouldn't hear that response in an unschooling family. My DD comes with me when I vote and it always triggers discussions about government and politics.

I'd also note that, due to a learning disability, my DH did not read his first book until adulthood, years after he'd dropped out of public high school.