Gonna stray a bit from the other games mentioned here for the sake of adding something unique.
It's not your traditional nazis per say, but the half life series fits quite nicely with this urge. The combine are genocidal, totalitarian, they use shit loads of propaganda, etc. They don't have the looks of it, but they're clearly the nazi type.
That is true. But we now have consumer drones that are very easily weaponized. The guards don't need to be human, but neither do the attackers.
And there's a limit to how good human/nonhuman security can be.