The holocaust was a time of darkness and little truth or reason. This is why so many people died and suffered. We can compare this to the "Dark ages" a period in time where not many discoveries were made, no information was spread, people did what others told them through "blind faith". So as a result people were easily manipulated and misguided into making bad choices and causing horrible events to take place. During this time no one questioned authority or why thing were done the way they were. This compares very closely to the holocaust because in Germany, it was begging a dark age with the collapse of the economy and Hitler used this to rise to power and manipulate and control a nation that didn't question his ideas, his motives or his horrific plans. They didn't challenge him because the needed someone in a time of downfall and they didn't care who, as long as they promiced hope. So as said before they were using a blind faith, this caused them to make decisions and follow orders that they didn't beloved or agree with, although they did have a choice and the choices they made they must live with. Germany was misled but they chose there path and that makes them who they were.
