In August 2004, a poll by Zogby International showed that 49 percent of New York City residents, with a margin of error of 3.5 percent, believed that officials of the U.S. government “knew in advance that attacks were planned on or around September 11, 2001, and that they consciously failed to act.” In a Scripps-Howard Poll in 2006, with an error margin of 4 percent, some 36 percent of respondents assented to the claim that “federal officials either participated in the attacks on the World Trade Center or took no action to stop them.” Sixteen percent said that it was either very likely or somewhat likely that “the collapse of the twin towers in New York was aided by explosives secretly planted in the two buildings.”
Conspiracy theories are by no means a strictly domestic phenomenon; they can easily be found all over the world. Among sober-minded Canadians, a September 2006 poll found that 22 percent believe that “the attacks on the United States on September 11, 2001 had nothing to do with Osama Bin Laden and were actually a plot by influential Americans.” In a poll conducted in seven Muslim countries, 78 percent of respondents said that they do not believe the 9/11 attacks were carried out by Arabs. The most popular account, in these countries, is that 9/11 was the work of the U.S. or Israeli governments.
(From Sunstein, Cass R. and Vermeule, Adrian, Conspiracy Theories (January 15, 2008). Harvard Public Law Working Paper No. 08-03; U of Chicago, Public Law Working Paper No. 199; U of Chicago Law & Economics, Olin Working Paper No. 387. Available at SSRN: http://ssrn.com/abstract=1084585 or http://dx.doi.org/10.2139/ssrn.1084585.)The consequences of irrational thought are far worse than merely denying dinosaur eras.