Although a substantial number of Poles participated in atrocities against Jews during the German occupation, the underground Polish state prohibited this and punished it firmly.

Whether the antisemitism of a substantial fraction of Poles should be held against "the Polish nation" is a complex question. Perhaps the answer has to be, "in some sense yes, and in some sense no." In any case, the answer should not be dictated by laws.

The fact that many Poles killed Jews even though une underground Polish state prohibited this demonstrates the strength of antisemitism in Poland -- so strong that the state could not fully enforce its prohibition.

Here's how the Polish state reported German atrocities to the allies.