Analysis of information sources in references of the Wikipedia article "Yahudi-Polandia" in Indonesian 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.
Suggested reading: Arieh J. Kochavi, "Britain and the Jewish Exodus...," Polin 7 (1992): pp. 161–175