They might be called sociology, but will disappoint those looking for charts and data. They might also be classified psychology, but will frustrate those looking for experimental evidence and behavioral theory. Miller is, above all, a humanist, someone who can discuss abstract concepts with admirable wisdom, wit, and learning. We don't get far into Miller's book on courage before realizing that what we normally mean by that word, what we all assume we know, varies so widely that even common definitions contradict. Put that way, we would say courageous.
People have it on posters hanging over their desks.
But suppose the man standing alone is a soldier refusing to march with his platoon into combat. Here the refuser takes a lonesome personal stand, subjecting himself to abuse, scorn and even punishment. Yet he is, literally by definition, a coward. He was not well liked. But that was his last moral moment.