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. No single standard can be applied to all selection decisions. Collections should reflect the needs of the community as much as possible. It is a good idea to review possible bias within the selection practice.
Some patrons are willing to express their concerns, and that is the extent of their complaint.
However there are instances when a patron will want to pursue the complaint, this is when the reconsideration policy is used. The single most important point in the reconsideration policy is the fact that the challenged materials will remain on the shelves during the entire reconsideration process. Read the reviews. Discuss selection criteria. Discuss as a group, and write a recommendation to the library director.