If it were a simple case of "here's a better option" there would be no need to ban it. If it were a perfect substitute, then teachers would just switch over to

If it were a simple case of "here's a better option" there would be no need to ban it. If it were a perfect substitute, then teachers would just switch over to the other option, and if not then there's no reason that a class can't read two books dealing with racism. No, you don't ban a book to encourage the reading of another, you ban a book to suppress it.