I believe your cynicism is highly misinformed.
Public libraries are great sources for..
ESL classes; job searching and employment resources; computers and Internet access for those who can't afford either/or; safe social gathering spots for teenagers and elderly citizens; academic resources for secondary and college students as well as writers of miscellaneous books and papers; audiobooks for everyone including the blind; tutelage help for the learning disabled and those who are having difficulty learning to read (even those who have long dropped out of high school; GED help; oh and books you self righteous ass.
Just because you are clearly too lazy to get your facts straight.... And so what if a large amount of library traffic is from the film and music department?!
Not everyone has access to bookstores or other systems of consumable culture. Not everyone has the disposable income to throw away on DVDs and books.
Plus Public libraries are funded through charitable donations both corporate and publicly and through sales of older books, etc....