It's not so much out loud. It's just more direct. The same rationale has been used to argue against charter schools and home schooling, because those undermine a leftist government's ability to brainwash kids, the state's future servants.

Imagine parents being able to chose not to send their kids to a school that teaches them to hate their parents, their community and their religion, and instead worship their benign and almighty government? Gasp!