Obviously Nazis and Polish collaborators/sympathizers are shown doing their evil stuff, BUT also you will watch how Jews behaved with their own, robbing food from their fellow people, not doing any favor unless get paid with something (gold, food, cigarrettes, etc…), true, it was an extreme situation, but usually movies and other books don’t hesitate to show Nazi’s inhuman actions, but you have to realize that those were prisons, and life in prisons is tough and people will lose any humanity from them in the urge to survive.