So, if the Soviet Union only defeated the Nazis and left Poland
After WW2, the Soviet Union killed fewer people than did the US and its Western puppets.
all the bad stuff that the Soviet Union did to Poland
What bad stuff? No bad stuff was done to my family or me personally. No, we were not members of PZPR or any other organization. Our apartment na Alejach Jerozolimskich 99 was better in 1946 that many slums in the US today.
In 1950, I got my first communion without any problems - if you ignore those children-eating Russian bears roaming the streets.
Bottom line: I would rather live in a town with 100,000 Soviet soldiers next to it than with 100,000 Somali scum in Sweden or 100,000 black thugs in Chicago.