Popper himself at least glimpsed that his youthful exaltation of tolerance for unlimited criticism was unavailing in many circumstances that resembled those the MPS was constructed to counter. For instance, in a long footnote in Open Society he grants the plausibility of paradoxes of tolerance (“Unlimited tolerance must lead to the disappearance of tolerance”) and democracy (“the majority may decide that a tyrant should rule”), but had little to offer concerning how those paradoxes should be defanged. Yet around the same time, Popper was already flirting with the Hayekian “solution”: membership in the Open Society had to be prescreened to conform to a “minimum philosophy”: but the principles of selection for that philosophy were never made as explicit as they were by Hayek in practice.

Philip Mirowski, Never Let a Serious Crisis …, loc. 199