All true, but you have to consider the fact that reprisals against civilians were not forbidden by international law until 1949. Back then the Germans were within the laws of war to make reprisals against civilians if they concluded that the civilians were supporting illegal combatants in the field. Partisans, the resistance, or freedom fighters as we call them were to a large extent illegal combatants back then, as they continue to be today. The laws of war, to this day, states that civilians shall obey the rule of an occupying army. Of course, executing civilians as reprisals is as revolting to us today as firebombing civilians is. Let's not forget that the Germans were not alone in deliberately killing civilians en masse.