Poland has historical problems with this claim...
The Historians Under Attack for Exploring Poland’s Role in the Holocaust
https://www.newyorker.com/news/our-columnists/the-historians...
The Historians Under Attack for Exploring Poland’s Role in the Holocaust
https://www.newyorker.com/news/our-columnists/the-historians...
Obviously there were cases of injustice and violence against Jews from the hands of Poles - tensions between different religious and national groups back then were nothing uncommon and we're talking about uneducated peasants in a pre-industrial environment, under horrendous situation of 5 year long war, and pressure from German occupants. There were case of violence between all sort of groups eg. https://en.wikipedia.org/wiki/Massacres_of_Poles_in_Volhynia...
The idea that Poles as a nation are guilty of some general crime against Jews, where they were the ones dying in the same concentration camps, built and run by the Germans, and trying to help Jews on organized institutional level is simply absurd.
https://en.wikipedia.org/wiki/%C5%BBegota
https://en.wikipedia.org/wiki/Warsaw_Ghetto_Uprising#Polish