The greatest achievement of working in public libraries is to help people to further their self education, and provide all the references they need for self help.
They are also used to provide all the library resources which many schools can no longer afford to provide.
They also provide social centres within the centre of the community.
Most importantly of all they provide help for people with low literacy skills, and help with adult literacy courses.
So every library closure comes with a very high social and economic cost.