Book: Six graves on the way to Munich

How could he explain to at least someone that, being an officer, a man of noble blood, and finally just a German, at one time he simply did not realize all the dishonor of this war unleashed by the authorities. It's like a man married to a drunkard also starts drinking to show his love for her. So he became an executioner, torturer and murderer for the sake of Germany. Is it really that simple?