Why Obama Should Learn to Love the Bomb

On Sept. 24, President Barack Obama will bring together 14 world leaders for a special U.N. Security Council meeting in New York. On the agenda: how to rid the world of nuclear weapons. The summit is the latest step in the administration's campaign to eliminate nukes, a priority Obama stressed on the campaign trail and formally announced in April during his speech in Prague. U.S. attempts to stop Iran from acquiring the bomb and to pry the weapons out of North Korea's fingers are also key parts of this campaign.

These efforts are all grounded in the same proposition: that, as Obama has said several times, nuclear weapons represent the "gravest threat" to U.S. security. This argument has a lot going for it. It's strongly intuitive, as anyone who's ever seen pictures of Hiroshima or Nagasaki knows. It's also popular; U.S. presidents have been making similar noises since the Eisenhower administration, and halting the spread of nukes (if not eliminating them altogether) is one of the few things Obama, Vladimir Putin, Hu Jintao, and Benjamin Netanyahu can all agree on. There's just one problem with the reasoning: it may well be wrong.

A growing and compelling body of research suggests that nuclear weapons may not, in fact, make the world more dangerous, as Obama and most people assume. The bomb may actually make us safer. In this era of rogue states and transnational terrorists, that idea sounds so obviously wrongheaded that few politicians or policymakers are willing to entertain it. But that's a mistake. Knowing the truth about nukes would have a profound impact on government policy. Obama's idealistic campaign, so out of character for a pragmatic administration, may be unlikely to get far (past presidents have tried and failed). But it's not even clear he should make the effort. There are more important measures the U.S. government can and should take to make the real world safer, and these mustn't be ignored in the name of a dreamy ideal (a nuke-free planet) that's both unrealistic and possibly undesirable.

The argument that nuclear weapons can be agents of peace as well as destruction rests on two deceptively simple observations. First, nuclear weapons have not been used since 1945. Second, there's never been a nuclear, or even a nonnuclear, war between two states that possess them. Just stop for a second and think about that: it's hard to overstate how remarkable it is, especially given the singular viciousness of the 20th century. As Kenneth Waltz, the leading "nuclear optimist" and a professor emeritus of political science at UC Berkeley puts it, "We now have 64 years of experience since Hiroshima. It's striking and against all historical precedent that for that substantial period, there has not been any war among nuclear states."

To understand why—and why the next 64 years are likely to play out the same way—you need to start by recognizing that all states are rational on some basic level. Their leaders may be stupid, petty, venal, even evil, but they tend to do things only when they're pretty sure they can get away with them. Take war: a country will start a fight only when it's almost certain it can get what it wants at an acceptable price. Not even Hitler or Saddam waged wars they didn't think they could win. The problem historically has been that leaders often make the wrong gamble and underestimate the other side—and millions of innocents pay the price.

Nuclear weapons change all that by making the costs of war obvious, inevitable, and unacceptable. Suddenly, when both sides have the ability to turn the other to ashes with the push of a button—and everybody knows it—the basic math shifts. Even the craziest tin-pot dictator is forced to accept that war with a nuclear state is unwinnable and thus not worth the effort. As Waltz puts it, "Why fight if you can't win and might lose everything?"