It makes me angry, when I see people online talking about the whole of the WWII Wehrmacht as if they are all uniform, fungible movie villains. This was a huge organization of human beings. The degree to which any individual is culpable needs to be considered on an individual basis. Human rights are absolute, even for the soldiers of the enemy. Principles like that are what separate free countries from tyranny.
This is not to say, that there isn't a group accountability for an organization like an army, where people are all wearing the same regalia and literally marching under the same banner. This implies a group responsibility for calling out the wrongs of one's own side. The morality of the faction can be measured as a whole by how well it calls out its own failures of principle, and by what principles it says it upholds and by what principles it eschews.