I know US Americans who unironically believe this. Like, when you mention how literacy rates improve dramatically when socialists are power say in Cuba or Nicaragua, they say that's only because they want to feed people "commie propaganda" and that's the only thing they are allowed to read.

Funny enough, the people I'm thinking of see nothing wrong with sending their kids to private Christian schools where learning about science involves teaching the earth is <10k years old and history is about how the Israelites left Egypt under Moses. They don't let their kids read Harry Potter and they can't listen to any music other than praise & worship and classical music. Ask me how I know...