I am not nearly as familiar with Nazi Germany, but if it was ANYTHING like Russia's Communists, then those who "truly" believed were well in the minority. But in any war, the various armies rely on indoctrinating their forces with an utter hatred of their foe. This includes an consistent and effective demonization of your enemies. This was especially true in the Pacific theatre where we refered to the Japanese as "Gooks" and "Nips".
In the case of Germany, the hype of their War Machine was such that there was NO ROOM for dissent. This was not restricted to their military, but was spread like a virus throughout the entire populace. Read what Goering said during the Nuremberg trails:
Naturally, the common people dont want war, but after all, it is the leaders of a country who determine the policy, and it is always a simple matter to drag people along whether it is a democracy, or a fascist dictatorship, or a parliament, or a communist dictatorship. Voice or no voice, the people can always be brought to the bidding of the leaders. This is easy. All you have to do is to tell them they are being attacked, and denounce the pacifists for lack of patriotism and exposing the country to danger. It works the same in every country.
It gives me chills because it reminds me of the rhetoric I heard RIGHT HERE IN AMERICA when we attacked Iraq. Think not that this country is free from religiously motivated bigots. We are CONTROLLED by them, and if we are not careful, we will be part and parcel to a genocide that will make Hitler look small time.
It is easy in our enlightened state to pass judgment on the common man in Germany. While I will not hold him up as a good example of resisting evil, I will also not judge him as I know the pressure was immense. After I pass through a similar crucible and am found to have a noble character, then I might point a finger. Until that point, I would only HOPE that I would have the intestinal and moral forititude to say NO. I said as much in this last election, but like Germany, the popular opinion seems to be against me.