if you use the excuse "just following orders," you are undeniably admitting that you knew it was wrong
hindsight is 20/20
you have no idea what i'm talking about do you? in a society where you are indoctrinated everyday that those people are not human, and can be killed without repercussions, and that infact it's RIGHT to kill them, and you were ordered to, then wouldn't you? and what if, suddenly, 5 years later, after you got steamrolled by some slavs and burgers, that those morals turned out to be wrong?
it's not you knew it was wrong, it's that, after all, it was wrong when you thought it was right.