Abstract
Charles Pigden's 1995 article "Popper Revisited, or What is Wrong with Conspiracy Theories?" stimulated what is today a fertile sub-field of philosophical enquiry into conspiracy theories. In his article, Pigden identifies Karl Popper as the originator of the philosophical argument that it is naive to believe in any conspiracy theory. But Popper was not criticizing belief in conspiracy theories at all, as Pigden defined them or as they have usually come to be understood since about the 1960s. Pigden has therefore fundamentally and anachronistically misinterpreted Popper. The object of Popper's criticism was, rather, the inadequate approach to social science that is limited to the discovery of human intentions, including conspiracies, in particular the will of Great Men. Popper's critique of the conspiracy theory of society was correct and should be rehabilitated. Pigden is correct only insofar as he concludes that we should not dismiss conspiracy theories without critical evaluation, a proposition with which Popper would likely have wholeheartedly agreed.