I think the issue is your framing of libraries as "the government's own libraries".

Those libraries are to the people and paid by the people.

Similarly, the school curriculum is not to be controlled by the government, public schools are also to the people and paid by the people.

In both cases, the criteria for school curriculum and the books to stock are pedagogy. What will best prepare and educate students so they can innovate, thrive and improve our society later in life.

Attempts at seizing control of the school curriculum or the material made available to students for their pedagogy (like books they can research) by the government in a way that appears to be for some political or value setting agenda and not the criteria of offering the best pedagogy for students feels like propaganda and information control for political gain.