Answer: factual evidence is used to appeal to the reader’s sense of logic.
The author of the excerpt provides factual evidence in order to illustrate the destructive nature of censorship. This includes giving the exact date of the occurrence (February 28, 1981) and the location of the schools that banned the book (Bloomfield, New Mexico). It also includes giving a direct quote from a school board member. All of these elements are intended to convince the reader of how destructive censorship can be by appealing to his logic.