Answer: We need government because people are flawed.
In this excerpt, the author argues that the reason government exists is because men are not angels. Men are not perfect, instead, they are flawed, and this means that they are often tempted to corruption, abuse, self-interest, and other detrimental acts. Government exists so we can regulate the behaviour of these people, who might otherwise abuse their power or act in a selfish way regardless of what is best for the nation.