Yeah, Nazis are pretty much zero-effort villains. Like orcs, or zombies, or guys in spiky black and red armour. You don't need any nuance or complexity, the answer to "Why are we shooting these fuckers?" is "They're Nazis." Explanation over. No need for a complex and interesting villain backstory, no need for the lingering question of what happens to the political scene when your heroic manslab strolls into the Reichstag and perforates high command with a shotgun, because in no context is preserving the remains of a Nazi government good.
They're Nazis. You can slaughter them in an increasingly brutal and savage manner, and still feel like the good guy afterwards because you were only killing Nazis.
