An email correspondent has sent in a couple of potentially controversial observations. I don't know if he wants to be named so I won't name him, but if he wants to name himself in the comments section that's fine with me.
He says that he has found a couple of references to Jewish Poles welcoming invading German Nazis during WW II, or at least not appearing to be as aware as they should have been of how thoroughly and irredeemably evil the Nazis were.
One such reference is here.
Another is here.
Of course many people thought that a civilized people like the Germans could never commit any crime so horrible as genocide, but It seems to me that by the time the Nazis invaded Poland their anti-Semitism was abundantly clear.
Of course there would have been isolated individuals who were naive or otherwise unwise when it came to assessing the Nazi threat.
I'm not sure of any larger meaning to these anecdotes.