This appears to me a gross misrepresentation of Spengler. Spengler at no point would have celebrated anything related to Nazism which included disdain for “Caesarism" (the politics of strong men and their followers, which Spengler characterized as the last stage of politics for any civilization in its dying phase) and his strong denouncement of Nazi anti-semitism and the idea of “aryanism" in his personal writings and statements.

Adding this line in is utterly unfair to arguably the most important social cycle theorist since Ibn-Khaldun. Without Spengler, the 20th century would have lost one of its most important and interesting thinkers. His vision was neither “dark" (he felt all societies would eventually renew themselves with new cultures and rise again, which I dont think anyone disagrees about) nor was it particularly close to Nazism. Please do not unjustly disparage thinkers just because some deeply evil people appropriated mutated versions of their ideas without their consent.