What is the author's style in Profiles in Courage by John F. Kennedy?

In writing Profiles in Courage, Kennedy's intention was to make a specific case about the importance of courage, and to do so within a straightforward historical context. He does not set out to produce a piece of biased propaganda in which the stories are dramatized for effect, but rather to provide an honest look at nine individuals. His presentation of facts has the feel of a textbook, and the author makes a point of including some comments about the people's flaws as well as their virtues. As a result, the reader has a better sense of what kind of person each senator was and sees that his human frailties did not impede his courageous intentions.