Hitler's attack on Russia was an preemptive strike - https://codoh.com/library/document/new-evidence-on-the-1941-barbarossa-attack-why/en/ Many historians also believe that the reason Stalin was preparing to attack Germany is because he wanted to use them as a proxy ("muh Nazis bad") to conquer entire Europe. Considering all that, Germans basically sacrificed themselves in order to prevent Soviets from taking Europe. One could say "but we are already ruled by the jews!!1!1!!" - just consider that it took them almost 100 years from end of WWII to slowly implement communism over Europe and only recently have they even begun to push Soviet stile regime, when back then they could have had entire Europe under full blown totalitarian communism in under a decade. The US Army prior to WW2 was getting ready to [invade Canada](https://en.wikipedia.org/wiki/War_Plan_Red), so they were 100% prepared for war and invasion and used it all to stab Germany in the back as they were already fighting a desperate suicidal war against Soviets. Not to mention an inhumane bombing runs they suffered from Brits who were intentionally bombing civilian targets and supply lines. Hitler offered multiped peace treaties before the full blown war, and they were all rejected - https://www.ihr.org/other/what-the-world-rejected.html