I don’t doubt it. Not everyone was innocent. But, acknowledging that, treating everyone as guilty, including people not yet even born, isn’t right either.
Absolutely.
Any large group of people will have those who behave under great stress with heroism and others with cowardice or villainy.
Correct -- plus Poles would point out that the Nazi rule was that any Pole harboring Jews would be shot, along with their family. That wasn't implemented in any other Nazi ruled state (not to mention that Poland, unlike France etc. never surrendered) -- so the ones that DID save Jews did so under extreme pressure not only to themselves but to their families. Despite this, many did save their Jewish fellow-countrymen