Dunno. It might have been a practical decision as opposed to a moral one.
If we didn’t aid Russia, the Germans MIGHT have been able to take Russia. If the Germans took Russia, they might have been able to finish off the rest of Europe.
More likely, though, Germany and her allies (why do people forget that Germany had allies?) would have been so busy digesting the USSR, that war would have been put on hold for 10-20 years.
“why do people forget that Germany had allies?”
Italy, Spain, Romania are pretty forgettable as allies....
I think Stalin and the Bolsheviks were very close to being overthrown by their own generals...had Hitler taken Moscow, I could have seen that happening. That’s why Hitler should have focused on taking Moscow, to undermine the leadership, yes they would have retreated East, but I don’t think under those circumstances, Stalin’s rule would have lasted much longer.