They provide their patrons with the information that they need to make educated, informed decisions.
Libraries represent all points of view without becoming political.
It is central to the library's mission that every patron regardless of education, economics or any other factors is entitled to free access to information. They can help to protect the library from challenges to materials within the collection. It is essential to have the policies in place before they are needed. Policies, and the procedures to implement them, need to be updates frequently. The selection policy should be applied to any donated material as well as material that is purchased.