> USA is ultra conservative on the average in comparison to just any European state for example.

Are you serious? The UK and Germany are arresting people for social media posts. That is actual impingement of free speech.

Relying on the ultra mainstream wikipedia for a banned book would be hilarious if it weren't so deeply disappointing. They'll list nothing interesting.

None of those books are banned.

The point is that those books aren't actually banned for general access. They may not be present in a school library, but you can certainly get them on Amazon.