Here's another really controversial take:
Had Poland expelled all of its Jews during or even after the Polish-Soviet War, then it could have ironically done them a blessing since much more of them could have subsequently ended up surviving the Holocaust. This would have, of course, depended on where exactly they would have ended up, but Poland, at 90%, had one of the highest Jewish Holocaust death tolls. In other words, they would have been in a better position in almost any other country, with more Holocaust survivors, perhaps even many more Holocaust survivors.
This is also why I think that Joseph Stalin ironically made a mistake in not deporting more Jews from the Soviet Union's westernmost territories to the Soviet interior in 1939-1941. It would have been brutal as Hell, but it would have also ironically saved most of these Jews' lives from the impending Holocaust since it would have placed them outside of the clutches of the Nazis. As it was, in real life, Stalin saved the lives of over 200,000 Jews in such a manner: