BS. We're the only reason "the most massive and powerful land force on earth" isn't speaking German today. Who do you think fed them and armed them with stuff that actually worked?Absolutely!!! Fighting Hitler was one thing, but the Commies should of been left to fend for themselves... dealing with an insane Hitler would of been better than dealing with a sane Uncle-Joe!!!!!!!!!
You have to look at the issue from the 1939-1945 perspective instead of today with the benefit of hindsight. At the time, the Nazis were seen as the greatest threat in Europe. The Soviets were too busy exterminating themselves with purges, starvation, and mass deportations to be seen as much of a threat. The Soviets would not have joined the allies had Hitler not made the biggest foul up of his life and launched Operation Barbarossa. Stalin was not in a position to fight a war and only did so when Hitler forced the Soviets into one.
Even though the Western Allies did not trust Stalin (and rightfully so) they knew at the time he was a needed ally. As the saying goes "The enemy of my enemy is my friend." I don't think Churchill and Roosevelt would have wanted Stalin as an ally if they knew the war was going to be quick and easy. However, they knew it wasn't so it became necessary to make a deal with the devil.