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In page Martin Heidegger:

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Heidegger's defenders, notably Arendt, see his support for Nazism as arguably a personal "error" (a word which Arendt placed in quotation marks when referring to Heidegger's Nazi-era politics).[5] Defenders think this error was irrelevant to Heidegger's philosophy. Critics such as Levinas,[citation needed] Karl Löwith,[6] and Theodor Adorno[citation needed] claim that Heidegger's support for Nazism revealed flaws inherent in his thought.