It is a school's job to provide every student with a comprehensive and well-rounded education, preparing them for their adult life in the best way possible. This includes exposing them to a variety of potential career paths, and providing them with role models.

The only reason they need collections like "LGBTQIA+" and "Diverse Voices" in the first place is because literally the rest of the collection will already be filled with "Classics", "Freedom", and "Family Values". Those are considered the default in society, there is no need to explicitly highlight them when you will already come across them without even trying.