Popper believed that Marxism had been initially scientific, in that Marx had postulated a theory which was genuinely predictive. When Marx's predictions were not in fact borne out, Popper argues that the theory was saved from falsification by the addition of "ad hoc" hypotheses which attempted to make it compatible with the facts. By this means, a theory which was initially genuinely scientific degenerated into pseudoscientific dogma. Popper agreed on the general non-falsifiability of the social sciences, but instead used it as an argument against central planning and all-encompassing historiographical ideologies. Popper devoted much attention to dissecting the practice of using the dialectic in defence of Marxist thought, which was the very strategy employed by V.A. Lektorsky in his defence of Marxism against Popper's criticisms. Among Popper's conclusions was that Marxists used dialectic as a method of side-stepping and evading criticisms, rather than actually answering or addressing them: Hegel thought that philosophy develops; yet his own system was to remain the last and highest stage of this development and could not be superseded. The Marxists adopted the same attitude towards the Marxian system. Hence, Marx's anti-dogmatic attitude exists only in the theory and not in the practice of orthodox Marxism, and dialectic is used by Marxists, following the example of Engels' Anti-Dühring, mainly for the purposes of apologetics – to defend the Marxist system against criticism. As a rule critics are denounced for their failure to understand the dialectic, or proletarian science, or for being traitors. Thanks to dialectic the anti-dogmatic attitude has disappeared, and Marxism has established itself as a dogmatism which is elastic enough, by using its dialectic method, to evade any further attack. It has thus become what I have called reinforced dogmatism.