I was just saying to my wife last night that we have the same problem with education as we do with diet: obsessing about what we avoid, instead of what we add.
Lots of people who home-school (not you, Scott) do it because they want to keep certain ideas away from their children. I think it would be better for the children -- and clearly better for society -- if parents instead countered ideas they oppose with other ideas, and explained why their ideas are better.
And with diet, people who focus on "no fat" or "no carbs" aren't generally as healthy as people who focus on "more greens" or "more vegetables."
I'm seeing this pattern often enough I'm starting to think it borders on a natural law.