The Real Nuclear Option

As President Trump rails against North Korea, threatening to rain down “fire and fury like the world has never seen” if it so much as tests another long-range missile, the world can’t help but wonder: Would he really do this? Would he order a nuclear strike, the ultimate fire and fury, against a country that hadn’t attacked us first?

Many are doubtful. His top security advisers would oppose such a move. So would the American people who, though they have no formal say in the matter, would impose constraints on a president’s actions—or so goes the conventional wisdom. Some scholars have written of a “nuclear taboo” ingrained in our sensibilities since the bombing of Hiroshima. Others detect a growing revulsion against the killing of noncombatants even with conventional weapons.

However, a new study suggests that these comforting notions are mistaken.