William Saletan writes: To believe that the U.S. government planned or deliberately allowed the 9/11 attacks, you’d have to posit that President Bush intentionally sacrificed 3,000 Americans. To believe that explosives, not planes, brought down the buildings, you’d have to imagine an operation large enough to plant the devices without anyone getting caught. To insist that the truth remains hidden, you’d have to assume that everyone who has reviewed the attacks and the events leading up to them — the CIA, the Justice Department, the Federal Aviation Administration, the North American Aerospace Defense Command, the Federal Emergency Management Agency, scientific organizations, peer-reviewed journals, news organizations, the airlines, and local law enforcement agencies in three states — was incompetent, deceived, or part of the cover-up.

And yet, as Slate’s Jeremy Stahl points out, millions of Americans hold these beliefs. In a Zogby poll taken six years ago, only 64 percent of U.S. adults agreed that the attacks “caught US intelligence and military forces off guard.” More than 30 percent chose a different conclusion: that “certain elements in the US government knew the attacks were coming but consciously let them proceed for various political, military, and economic motives,” or that these government elements “actively planned or assisted some aspects of the attacks.”

How can this be? How can so many people, in the name of skepticism, promote so many absurdities?

The answer is that people who suspect conspiracies aren’t really skeptics. Like the rest of us, they’re selective doubters. They favor a worldview, which they uncritically defend. But their worldview isn’t about God, values, freedom, or equality. It’s about the omnipotence of elites. [Continue reading…]