I can see certain nations, on the far side of the world, having a certain isolationist attitude, and coming late to the war.
In other news, nobody is praising the international banking system for winning World War 2.
Anyway, one major difference between Soviet Russia and the other Allies was that Soviet Russia began the war on Germany's side, and accepted half of Poland as a payment for letting Hitler have a free hand in Europe. Russia switched sides only after Hitler betrayed them, and sacrificed all those Russian soldiers through incompetence and shortsightedness, rather than any sincere desire to defeat Nazism or bring peace and freedom to Europe.
I don't expect these stories to go away either. But you might want to study them a bit, this one especially. War turns out to be no different from any other human story. There are good deeds and bad deeds. Good people and bad people. A right side and a wrong side. There are compromises, and refusal to compromise. There are difficult choices made, some rightly and some wrongly. There are good things done for bad reasons, and bad things done for good reasons.
The story of World War 2 is rich in lessons for us, wherever history may find us. To our shame, perhaps, the U.S. stayed out of the war for far too long. But you seem to be equating the shame of U.S. isolationism with the shame of Soviet land-greed and wilful ignorance. The two aren't even remotely comparable. I strongly urge yout to make a more detailed study of the complexity and nuance of this major conflict and significant historical turning point. "Sure, the Soviets raped Poland while the Nazis held her down, but hey, the U.S. was late getting involved, so it all evens out" is a pretty lame comeback.
Besides, I am reading up on "certain latecomers". Far from making WW2 possible (except possibly in the sense of "making it possible for Great Britain to fight WW2 alone for three years"), it seems as though the U.S. government did everything it could possibly do to join in, short of forcing an unconstitutional war on a free citizenry that was not yet convinced that war was a good idea. It seems that the U.S. actually gave everything it could, as quickly as it could.
Would you mind explaining exactly how the U.S. made the war possible, by staying out of it. Try to come up with an act of the same magnitude as "how about if we hold Poland down while you rape her", because "we'd rather not get involved in your mindless slaughter of each other" seems like a pretty reasonable starting point for the U.S., to me.
 Well, except in the narrowest sense of "defeat the invader of our motherland".