Unfortunately as beacame clear in a few years, it turned out to be a Pyrrhic victory with so many of the people liberated from the nazis only to fall under the dictatorship of the commies.
You need to understand that President Roosevelt's goals, and those of Americans of the 1940s, never included the rescue of Eastern Europe from either Nazis or Communists.
To the vast majority of Americans, Eastern Europe might as well been the far side of the moon.
Americans were not willing to die to save Eastern Europe from anybody.
What Americans did care about were Britain and France -- Britain because most Americans came from British ancestry, and France because the United States owed a huge debt of gratitude to the French for their financial and military support during the American Revolution.
So Roosevelt's major goals in Europe were to first save Britain and France, then defeat Germany thoroughly enough it would never again threaten the world.
And since those goals were met, to someone like Roosevelt the rest was unfortunate, but unavoidable.