Analysis of information sources in references of the Wikipedia article "폴란드 유대인" in Korean language version.
There were people everywhere who were prepared, for whatever motives, to do the Nazis' work for them. And if there was more anti-Semitism in Poland than in many other countries, there was also less collaboration.... The Nazis generally preferred not to count on outbursts of 'emotional anti-Semitism', when what was needed to realize their plans was 'rational antisemitism', as Hitler himself put it. For that, they neither received or requested significant help from the Poles.
"By the end of the war, 3 million Polish Jews—90 percent of the prewar population—had been murdered by the Germans and their collaborators of various nationalities, one of the highest percentages in Europe."
Suggested reading: Arieh J. Kochavi, "Britain and the Jewish Exodus...," Polin 7 (1992): pp. 161–175