The first thing that I noticed when watching the Milgram experiments, was that while the volunteer was clearly upset about what they were doing, and asked multiple times if they should stop, they immediately continued after learning that all of the responsibility was placed upon the scientist. At hearing this, the man would shake his head, and continue shocking a man that he believes is either dead, or in the active process of dying. This, I feel, is the most important way to look at Nazis "following orders". In a society, much of what is perceived as right or wrong is decided through the community reacting to actions. If a person continued to do something that society considers "wrong", but they do nothing about it, that person will most likely keep doing it. In my opinion, this is what happened in Germany. People were allowed to do immoral actions against the Jews, and because there was nobody to fight back against it, it became ok. Especially because there was always some commander, someone of a higher rank, there to take the blame if anything goes wrong, it makes it so people don't worry about any sort of reaction from anyone else, because they can place their actions on someone else. If someone came into the Milgram experiment and yelled at the volunteer for letting a man die, he would probably immediately deflect to the other man in the room who told him to do it, even though he could have left at any time, and was clearly the one to press the button which supposedly killed the man.
One of the things that first stuck out to me when I read the passage from "Ordinary Men" was Major Trapp. His reaction to his orders, to round up and murder Jews in a town, was so emotional and sad, and yet, he immediately sent his men to follow these orders. His exact words, "orders are orders", does show how he moves any sort of blame or accountability away from himself and to the faceless entity that is the Nazi regime. After feeling his initial horror for his orders, instead of deciding to not do it, he just decides that there isn't anything he can do. Another important part of this is that he sends his men to carry out the orders. He doesn't do anything himself, even though he is the one that actually sends his men to take part in this murder. Again, this shows another way that accountability is moved. Trapp gives it to his soldiers, and even stays away from any of the areas where the murders are taking place.
Now, in no way does any of this lessen any of the crimes committed. Just because someone believes that the blame will rest one someone else, and therefore shouldn't be worried about a specific action doesn't mean that the action should be allowed. While the nature of their crimes is still the same, I do think that the whole amount of blame shouldn't only rest on them. If there is nobody that tries to stop people, even by just saying, "this is wrong, you shouldn't do this", then the people around Nazis, should also have some sort of blame. Again, there should still be full amounts of blame on the Nazis that were part of Einsatzgruppen, it is also important to look at those around them to see how they were so comfortable committing the acts they did.