Actually, prior to the War, exiling Jews was official Polish policy. In 1925 Poland was far more anti semitic than Germany. Poland urged its Jewish citizens to emigrate to Palestine. After the War, survivors returning to their confiscated homes were met by hostile Polish squatters.
I don’t blame the Holocaust on Poland or any individual Poles, but the Germans probably had no problem recruiting helping hands among the Poles. BTW, the country that was Poland in 1925 contained a lot of towns and regions that were German speaking and had been part of the German Empire prior to the Great War. Young men living in German speaking regions of Poland and the former Austro-Hungarian Empire were drafted into the Wehrmacht as if they were citizens of Germany, once the Reich occupied their homelands.
After the War, and during its late stages, about a million German speaking civilians were killed, and millions turned into refugees, as Eastern Europeans drove Germans out of what had been German speaking enclaves.
“exiling Jews was official Polish policy”
No, helping Zionists form Israel was official Polish policy. The Poles even went so far as to arm and train Polish Jews in paramilitary groups such as Haganah, Irgun and Lehi - BEFORE WWII. Now, the end result might be the same - fewer Jews in Poland - but that is a lot different than “exile”.
You might want to read On the Edge of Destruction: Jews of Poland Between the Two World Wars
by Celia Stopnicka Heller.
That was Stalin's doing, he drew up the maps for Eastern Europe after the war.
Actually the one time that Polish policy was for exiling Jews occurred in 1968, under the Communists.
https://en.wikipedia.org/wiki/1968_Polish_political_crisis