It’s not a blanket dismissal.
Of course some conspiracy theories, under our definition, have turned out to be true. The Watergate hotel room used by Democratic National Committee was, in fact, bugged by Republican officials, operating at the behest of the White House. In the 1950s, the Central Intelligence Agency did, in fact, administer LSD and related drugs under Project MKULTRA, in an effort to investigate the possibility of “mind control.” Operation Northwoods, a rumored plan by the Department of Defense to simulate acts of terrorism and to blame them on Cuba, really was proposed by high-level officials (though the plan never went into effect).13 In 1947, space aliens did, in fact, land in Roswell, New Mexico, and the government covered it all up. (Well, maybe not.) Our focus throughout is on false conspiracy theories, not true ones. Our ultimate goal is to explore how public officials might undermine such theories, and as a general rule, true accounts should not be undermined.
Within the set of false conspiracy theories, we also limit our focus to potentially harmful theories. Not all false conspiracy theories are harmful; consider the false conspiracy theory, held by many of the younger members of our society, that a secret group of elves, working in a remote location under the leadership of the mysterious “Santa Claus,” make and distribute presents on Christmas Eve. This theory is false, but is itself instilled through a widespread conspiracy of the powerful – parents – who conceal their role in the whole affair. (Consider too the Easter Bunny and the Tooth Fairy.) It is an open question whether most conspiracy theories are equally benign; we will suggest that some are not benign at all.
Of course, his definition of a false, malicious conspiracy needs to exclude the NSA machinations based on a pre Snowden level of knowledge, while including stuff like “The International Jew”.