In Barbara W. Tuchman's "The March of Folly: From Troy to Vietnam," a central theme revolves around the desire for affirmation over information. This concept highlights how individuals or societies may prioritize validation for their beliefs and decisions, often ignoring critical information that contradicts their views. Such a tendency can lead to misguided actions, as the need for reassurance can overshadow rational decision-making.

Tuchman explores historical events where leaders and groups followed paths driven by affirmational needs, leading to folly rather than wisdom. The book illustrates that this mindset can result in catastrophic consequences, as seen in events from ancient Troy to the Vietnam War. Ultimately, the narrative serves as a cautionary tale about the dangers of seeking comfort in confirmation rather than being open to the full spectrum of available information.