Blame the Allies at Versailles for that. They were the reason that Hitler rose to power. Had they not run up the score and spiked the football, there would have been no Hitler. I find it funny, that the Soviets did the same and the Allies did nothing to stop them. Patton was right, we should have taken Berlin and headed straight to Moscow.
Patton was right, there is no dodging that one.
Versailles was also largely France's idea as the USA withdrew from the world (isolationism) and the UK was not eager to see a hobbled Germany (thereby giving France a free hand in the continent). But France suffered grieviously in WWI - most of the battles of the Western Front were on its territory and it lost millions of people. That traumatised them affecting their performance in WWII
However, while Versailles was the reason given by H, it was not the direct reason he was elected. The direct reason was the depression and the massive inflation in Germany AND the "stab in the back theory"
Versailes and war indemnities were bad, but worse was that the Entente never took the war inside Germany, and the German generals gave up command to civilians and then blamed them (Stab in the back) - so ordinary Germans thought "what the hey? We have troops in other countries and now we are surrendering? It must be some conspiracy")
Patton was right. It would have saved millions of lives.