Destruction and novelty are deeply connected in Heidegger’s thought, especially between the late 20’s and the 40’s, when he developed his “history of Being“ (“Seinsgeschichte”). Heidegger distinguished (initially in a messianic, finally in a dualistic and antagonistic way) destruction as condition of possibility for “another beginning” (event) from a “desertification” (“Verwüstung”) as nihilistic and destructive tendency leading to the /impossibility /of any decision and the lost of a real novelty. His Antisemitism of the late 30’s and 40’s was associated with it. Confusingly, his radical separation of a positive and negative destruction went hand in hand with a difficulty to distinguish one from another. This difficulty is reflected in Heidegger’s struggle with Nietzsche and National Socialism in the years around 1938. In my talk, I will focus on this uncertainty and its philosophical and political aspects.