We have, broadly speaking, two groups deciding which books to make available to children using taxpayer money - the voters/parents/elected officials, and unelected librarians. If one of those groups decides to withhold a book from schoolchildren, it's fine and not a ban. But if another does the same, then it's a ban.

Or am I completely wrong, and Jared Taylor's "White Identity" is available in every school library, explaining its absence from "banned" book lists?