History /
Polish hatred towards Jews... [1290]
Harry, whether you like it or not, deny or not, collective responsibility was a rule.
The difference between Poles and other nations (from western Europe and Baltics) in treatment by German invaders was significant. Dutchmen, Frenchmen, Estonians in Nazi plans were to built one thousand years lasting Third Reich, Poles, just after, Jews, Gypsies and Russians were subhumans to be exterminated. Germans during WW2 didn't care about lives of few Poles more or less. This is why they used a collective responsibility so willingly to decrease potential help to Jews at any price. In this case price was low: a cost of ammo used in such murders. You should also know that first victims of German terror were (mainly) Poles and Jews when Germans started to implement "Intelligenzaktion" in late September 1939 and took 60.000 causalities till spring 1940. Direct terror did not target Jews themselves, but in parallel Poles, what Jews are hardly aware.
It was a common rule, used from 1941/42, when Germans found hidden Jews they usually did not bother with details like special courts and legal procedures, they killed at the place all Jews, and all Poles who could be potentially involved without time consuming investigations and so on. Just because. Subhumans weren't individuals to be protected by law.