Accidental evil? No.
Fascism is fundamentally driven by a realized nihilism where pure destruction is the actual goal, rather than an accident. From the very beginning, the Nazi party explicitly promised the German people wedding bells and death, including their own deaths and the death of the Germans. The population reportedly cheered for this not because they misunderstood the message, but because they actively desired to wager their own destruction against the death of others.
According to Joseph Goebbels, Hitler operated in a world "in which even success makes no sense,"[0] meaning the movement prioritized an "intense line of pure destruction and abolition"[1] over any constructive political goals.
This intentional drive toward self-destruction culminated at the end of World War II. In his 1945 Telegram 71, Hitler declared, "if the war is lost, may the nation perish". Instead of trying to protect his country in defeat, Hitler actively joined forces with his enemies to complete the destruction of his own people by ordering the obliteration of Germany's remaining civil reserves, water, and fuel. The devastation of Germany was therefore not an accidental failure to achieve greatness, but the logical, intended conclusion of the "suicidal state" fulfilling its death drive.
0. Joachim Fest, Hitler and The Face of the Third Reich
1. Gilles Deleuze and Félix Guattari, A Thousand Plateaus.