Kids that go to public schools are the firsts to need public accessible knowledge because guardians cannot afford a personal collection.

Hence me suggesting people try to organize something together, not to bear the cost alone (note that used books can be found for cheap... but for that people should at least know used books are a thing and since most don't read much anymore, they probably have no clue)

Knowledge is lost when we do not copy.

Indeed.

Note that knowledge is also lost the moment we (the elders) stop transmitting kids the desire (and the ability) to read.... which is very precisely and very, very actively what our society is doing right now to those kids. And no school would feel that entitled to ban a single book if they new parents were worrying about what's going with books and reading in that library.