Pointing out your ignorance is a great use of sarcasm. It was not just Poland, obviously.
Poland don't hate everything remotly left wing. I consider leftist. We are not found of comunism, but a socialism find and well. Many thing that you'd consider lefty we consider central, basicly normal or civil right (like universal health care, maternity leave, free higher education, etc). But we are not found of dictatorship, genecides, tyrany and basic fucking monsters who -just an example - deliberetly starved millions.of Ukrainians.
Did you know that the same pilots were not allowed to participate in the victory parade? Most of them never saw home again.
You seems to make an argument that this was either one or another. Putting aside that you ask to split hairs between two most inhuman system in human history. I encourage you to google soviet crimes on occupied Poland during WW2... Did you took a second to do it? Google Katyn Massacre while you at it. Or did you forget that Stalin was hitler's ally at first and that they attacked Poland together? Or did they still teach you that WW2 started at Pearl Harbor? American exceptionalism didn't stop you for a moment from assuming that decimation of my nation would be something I know about? And maybe the 1st Wikipedia page wouldnt be something revelatory to me? This is, "I'll teach this Italian people in Italy how to make REAL expresso" level of 'mericanism.
All this asife, it is simply a false dyhotomy. The better deal could be struct. There were means. There was no will.
There is always a reason to explain terrible things. There is always some pragmatics argument for Yalta, for Hiroshima, for Guantanamo... Sure, you want to be a pragmatic about it... But don't fucking celebrate it. And apploding Stalin for ending Nazism is like celebrating golum for destroying the one ring. Only more cruel.