It is a political statement about the freedom of press though, no? Some libraries ban books, others do not. But that doesn’t mean it’s not political.

No, but it is a result of international western politics that Mein Kampf is widely available to read

I think it's generally understood that people read Mein Kampf because they want to understand Hitler and not because they agree with him.

Not always! https://www.youtube.com/watch?v=Rk3lcEeoEy8

Not always, but usual. It isn't that strange for a library to have a copy and it isn't that strange to check it out although the librarian is definitely checking you for swastika tattoos.