Karl Popper

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Person.png Karl Popper  Rdf-entity.pngRdf-icon.png
Karl Popper.jpg
"Conspiracy theory of society" critic
Member ofMont Pelerin Society

Sir Karl Raimund Popper (28 July 1902 – 17 September 1994) was an Austrian-born British[1][2][3]

One of the 20th century's most influential philosophers of science,[4] Karl Popper is known for his rejection of the classical inductivist views on the scientific method in favour of empirical falsification. According to Popper, a theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can (and should) be scrutinised with decisive experiments. Popper was opposed to the classical justificationist account of knowledge, which he replaced with critical rationalism, namely "the first non-justificational philosophy of criticism in the history of philosophy".[5]

In political discourse, Karl Popper is known for his vigorous defence of liberal democracy and the principles of social criticism that he believed made a flourishing open society possible. His political philosophy embraced ideas from major democratic political ideologies, including socialism/social democracy, libertarianism/classical liberalism and conservatism, and attempted to reconcile them.[6]

Conspiracy theory of society

Karl Popper criticised what he termed the "conspiracy theory of society," the view that powerful people or groups, godlike in their efficacy, are responsible for purposely bringing about all the ills of society. This view cannot be right, Popper argued, because "nothing ever comes off exactly as intended."[7] According to philosopher David Coady, "Popper has often been cited by critics of conspiracy theories, and his views on the topic continue to constitute an orthodoxy in some circles."[8] However, philosopher Charles Pigden has pointed out that Popper's argument only applies to a very extreme kind of conspiracy theory, not to conspiracy theories generally.[9]


  1. "Fifty Major Political Thinkers"
  2. "Karl Raimund Popper 1902–1994"
  3. "Karl Popper (1902–1994)"
  4. "Profile: Karl R. Popper – The Intellectual Warrior"
  5. "Rationality versus the Theory of Rationality"
  6. "Karl Popper (1902–94) advocated by Andrew Marr"
  7. "Conjectures and Refutations, 4th ed", Karl Popper, publisher Routledge Kegan Paul, 1972
  8. "Conspiracy theories : the philosophical debate", David Coady, publisher Ashgate, 2006
  9. "Popper Revisited, or What Is Wrong With Conspiracy Theories?" Charles Pigden, 1995, journal Philosophy of the Social Sciences
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