What are the motifs in Hiroshima by John Hersey?

The unstated but obvious theme of military morality runs throughout the text. It is perhaps most noticeable in the latter sections of the book, and is developed by two primary methods. First, the journalistic and objective presentation of effects of atomic detonation establishes a strong and unarguable position that nuclear weapons cause horrific damage and incalculable suffering. This method of development is straightforward; a more-subtle method is also used. The author evidently feels that atomic weapons are immoral.