I’ve read couple of autobiographies of Jews who were from Poland and ended up in the camps and survived.
They tell of living in Poland with the Polish people all in same town and they were neighbors and friends before the WAR. When War started and got ramped up after a few years, Poles, their best friend and neighbors would turn them in for food, for housing, for clothes because they needed to feed and house their families. When Jews got arrested, Poles were there cleaning out their houses for jewels, furniture, food, gardens, etc.
Yes, some Poles did help the Jews but lot looked the other way for self-survival. Lot of Poles were captured and worked to death in the work camps to make clothes, bullets, boots for the Germans.
United States knew what was happening and we turned a blind eye as we didn’t want to get involved until our hand was forced
As a world, we all had a hand in the Holocaust.
That certainly happened. There is a sizable percentage in any population that will do immoral things to survive when conditions are harsh.
That's not to excuse those folks. Those folks are criminals. But, as I'm sure you'll agree, it's wrong to blame the Polish nation as a whole.