I agree that the main goal is to reduce the access of children and young adults to these book, compared to the status quo. I don't think anyone is disputing that, one of the common rationales given being that these books are "inappropriate" for them.
However, framing this as a de facto book ban is definitely "editorializing".
> It has two of the three[1][2]. You need to reevaluate your assumptions here.
Touché. That isn't the typical high school though. It seems like a very good one, with competitive merit-based admission, and eight Nobel Prize-winning alumni. [1] Even then, you can see the biases of the high school librarians if you take a look at the collections page [2]: "LGBTQIA+", "BIPOC Reading List", "Grade 1: Inclusion contributes to a community’s diversity", "Indigenous Math & Science Collection", "Diverse Voices", etc.
Do you disagree that these are topics favored by left-wingers? Do they have collections promoting "Nuclear Energy", "Classics", "Freedom", "Family Values", "Meritocracy", or even "Personal Responsibility"?
> I grew up in a district where students simultaneously have access to one of the largest public library systems.
Good for them. I very much support that. Although there are significant biases in the procurement process for the public libraries, I assume their situation is probably much better than public school libraries.
[1]: https://en.wikipedia.org/w/index.php?title=Bronx_High_School...
[2] https://collections.follettsoftware.com/collections/public