The libraries in the schools I attended were primarily used to detain misbehaving students in quiet. The public library was much larger and was indeed worthwhile as a library per se. But our school libraries were small and poorly funded. That was fine: they still served a useful purpose.

It appears that today's school libraries and libraries in general have become a means for activist liberal political groups to introduce children to political/social ideas that, perhaps, those children are not yet prepared to deal with (YMMV). As a child I went to the public library for science and they had it in spades. Nowadays the science is still there but the librarians would rather you read something else.

My inclination is to de-fund any organization that pursues a political/social agenda by taking control of established institutions of government (schools, libraries, etc.). If necessary, I would de-fund the institution being abused.