I hate commies immensely, but that was at the very end of a conflict wherein Germans literally waged a war to exterminate the Russian people. 1/3 of Russian prisoners of war were murdered before they even made it to a camp. Nazis wiped out whole cities as a matter of course. Hitler fought the Russians in a way that went beyond fighting Bolshevism and was more akin to an attempted genocide. He refused surrenders from Leningrad because he wanted the whole city to die. Up to 10 million Russians were killed - not casualties, actual deaths - in that war, double that of the Germans. If you eliminate every other theater of war except the Eastern Front it's still the most devastating war in human history.
The rape and looting of Berlin was a tragedy but let's not act like it is a uniquely Communist thing to loot and pillage the capital of the country that inflicted that upon you in a surprise attack after your government tried to appease them for years. It's sadly, extremely human. Things like Stalin's Dachau on the Black Sea is more emblematic of commie hypocrisy than a soldier looting Berlin.
(Sorry, I might be going through Hardcore History's series on the eastern front)