Poles in the German Army? U.S. soldiers at Normandy reported taking Polish prisoners in German uniform. They may have been ethnically German. I know the Germans enrolled people with German surnames in Russia whose families had been there 300 years having been invited by Catherine the Great.
I think it’s true that a lot of Poles reported Jews or killed them during the war period. There are stories of Poles massacring Jews who tried to return to their homes after the war.
I’m not denying that isolated incidents occurred, I am very familiar with Kielce and Jedwabne.
It is one of the tragedies of the war, that between the Nazis and the Soviets, they created an ever greater wedge between Gentile and Jewish Poles. And the post-war Soviet-Puppet Communist government of Poland, managed to drive out most of the remaining Jews from Poland.
Only with the fall of Communism, were Poles made aware of the true extent of the Holocaust and the atrocities that occurred on their soil. The current Polish government has gone to tremendous lengths to raise awareness and to commemorate these horrible events, and for that, they deserve a lot of credit.