People are misunderstanding what PBS is and what it's mission is.
Public Broadcasting Service
It's goal is to show everything in the public interest. If it showed nothing but democratically funded programming, it would truly be propagandist. Fact is, they're showing anything that anybody pays to put on the air so long as it isn't outside the scope of its mission.
This program isn't. If nothing else, it can (and in all likelihood will) show people just how far around the bend the right has gone in order to make money off of education rather than fulfill the actual duty of educating America's children.