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Stephen M. Walt: Where Do Bad Ideas Come From?

[Stephen M. Walt is the Robert and Renée Belfer professor of international affairs at Harvard University and a blogger at ForeignPolicy.com.]

We would all like to think that humankind is getting smarter and wiser and that our past blunders won't be repeated. Bookshelves are filled with such reassuring pronouncements, from the sage advice offered by Richard Neustadt and Ernest May in Thinking in Time: The Uses of History for Decision Makers to the rosy forecasts of Matt Ridley's The Rational Optimist: How Prosperity Evolves, not to mention Francis Fukuyama's famously premature claim that humanity had reached "the end of history." Encouraging forecasts such as these rest in part on the belief that we can learn the right lessons from the past and cast discredited ideas onto the ash heap of history, where they belong....

Yet this sadly turns out to be no universal law: There is no inexorable evolutionary march that replaces our bad, old ideas with smart, new ones. If anything, the story of the last few decades of international relations can just as easily be read as the maddening persistence of dubious thinking. Like crab grass and kudzu, misguided notions are frustratingly resilient, hard to stamp out no matter how much trouble they have caused in the past and no matter how many scholarly studies have undermined their basic claims.

Consider, for example, the infamous "domino theory," kicking around in one form or another since President Dwight D. Eisenhower's 1954 "falling dominoes" speech. During the Vietnam War, plenty of serious people argued that a U.S. withdrawal from Vietnam would undermine America's credibility around the world and trigger a wave of pro-Soviet realignments. No significant dominoes fell after U.S. troops withdrew in 1975, however, and it was the Berlin Wall that eventually toppled instead. Various scholars examined the domino theory in detail and found little historical or contemporary evidence to support it.

Although the domino theory seemed to have been dealt a fatal blow in the wake of the Vietnam War, it has re-emerged, phoenix-like, in the current debate over Afghanistan. We are once again being told that if the United States withdraws from Afghanistan before achieving a clear victory, its credibility will be called into question, al Qaeda and Iran will be emboldened, Pakistan could be imperiled, and NATO's unity and resolve might be fatally compromised. Back in 2008, Secretary of State Condoleezza Rice called Afghanistan an "important test of the credibility of NATO," and President Barack Obama made the same claim in late 2009 when he announced his decision to send 30,000 more troops there. Obama also justified his decision by claiming that a Taliban victory in Afghanistan would spread instability to Pakistan. Despite a dearth of evidence to support these alarmist predictions, it's almost impossible to quash the fear that a single setback in a strategic backwater will unleash a cascade of falling dominoes....
Read entire article at Foreign Policy