“It’s 1938 and Iran is Germany … The Jewish people will not allow a second Holocaust.” Israel’s prime minister, Benjamin Netanyahu, recited slogans like these incessantly for decades, urging action against the gravest threat to the Jewish state – a nuclear-armed Iran. He conveyed the message to successive US presidents. He presented a bomb cartoon at the UN. At countless Holocaust memorial events he described Iran’s nuclear ambitions as the present-day “final solution”. Netanyahu talked and talked about the pressing Iranian threat, but his listeners were not convinced. They dismissed him as an alarmist whose deadline Iran crossed year after...