I'm an adult. I don't need someone who has studied childhood education to tell me what books to read, for fucks sake.

Sorry, I was taking about school libraries.

For your public library, if they get requests for books, they get the books. Lots of people want to read fantasy romance, so those are the books they buy. Hardly anybody requests the anarchist's cookbook, so they rely on interlibrary loan to get it when someone wants it. They buy the books that are popular. This isn't rocket science.

Just about any book you want is going to be available. This is what libraries do.