The claim is true as a general statement. A clear historical example is the British political leadership in the 1930s: the government pursued appeasement even as Nazi Germany rearmed and then remilitarized the Rhineland, while Churchill warned that the German threat was being underestimated. That shows a broad political class can indeed be wrong. Sources: U.S. Holocaust Memorial Museum, “The British Policy of Appeasement toward Hitler and Nazi Germany” (`https://encyclopedia.ushmm.org/content/en/article/neville-chamberlain`); RAF Museum, “Churchill’s Warnings” (`https://www.rafmuseum.org.uk/research/online-exhibitions/history-of-the-battle-of-britain/churchills-warnings/`).