Some Poles DID assist the Nazis - so did Jews.... Some people were all too happy to extort Jews (known as szmalcowcy) or turn them in to the Nazis for money. Everytime Israel brings up Polish crimes against the Jews or any perceived collaboration, it is the duty of Poles to point out that Jews too collaborated with Nazis and even more so the communists. They backstabbed the very same group, the AK, who had set up Zegota which was an organization specifically designed to help save Jews and indeed saved thousands of them. The AK also tried to liberate the Warsaw Ghetto and blow up the walls but was thrwarted by the Nazis. Despite the AK's heroism and high death toll in operations specifically designed to help the Jews, the Jews decided to kill AK members anyway. Poles must point out that Jews were all too quick to join the commie ussr backed AL and Red Army as well as occupy the ranks of the UB and commie kangaroo courts, which sentenced countless AK soldiers who had just a few years ago risked their lives to help Jews. That doesn't matter to such Jews though - they just wanted power and money and the USSR gave it to them. People like Morel and Michnik betrayed the same people and groups who had saved Jews just years before. It mattered nothing to them. They wanted to kill AK members despite the sacrifices of this group, and kill they did - thousands upon thousands of AK members including top generals who sent their own men to die just to help Jews.
This is the kind of thanks that Poland gets from Israel.... What's the moral of the story? If this ever happens again, don't help the Zionists because if they're given a license to kill years down the line they'll just end up killing you anyway, regardless of your own sacrifices and heroism trying to help them.
There were plenty of totally assimilated Polish Jews
Of course there were - as I wrote above. Nonetheless, the majority of Jews living in Poland were not assimilated into Polish society. They set up their own parallel institutions in their own neighborhoods, which Poles permitted and would even frequent for shopping. Most, again not all, Jews did not speak Polish - they spoke Yiddish, especially in the Jewish quarters of Warsaw and Lodz. This is one of the reasons why it made it so difficult to hide Jews as so many simply didn't speak Polish and looked straight up Jewish.
Imagine you're a Pole and hiding a young Jewish boy. A Nazi comes in and even if that boy speaks perfect Polish, you insist that he's your nephew or son or whatever, so the Nazi asks the boy to pull his pants down - instant giveaway. If their schmekel didn't ultimately give them away, their hard Yiddish accent, curly hair, appearance, etc. would first.