Because being able to read book is good for society.

> a nonprofit or a charity would be a much better framework

Why?

I do agree that libraries (in the UK at least) have mostly failed to see the writing on the wall and diversify. I used to live near a library that was on the edge of a super popular park. They had a "give us improvement suggestions" thing and I spoke to them about taking advantage of the park - it would have been a prime spot to open a cafe attached to the library. They actually couldn't comprehend that idea. Like, that's not what libraries are.