To address a serious issue such as an essay on gun control legislation, a person should survey the available statistical data on the subject. Thus, he may relate the data to a hypothesis of the essay, such as that increasing the number of weapons causes an increase in domestic violence. Statistical data therefore serve as evidence of the essay.
i dont think there is any reason. you might find that the author has the same themes that he/she likes to write about but idk i think you need to read the book
