dark side of people(use book In the Lake of the Woods by Tim O’Brien)

Project description
Only use In the Lake of the Woods as subject. No outside information. Write an essay in which you discuss how this theme(I choose dark side of people) was primarily introduced, how it was developed over the course of the novel, and what views on human behavior it imparts. When discuss the theme, use evidence from the novel. Evidence can be direct quotations(need page number) and summaries.