Not all Germans were NAZIS (elimination of races, Aryan race, final solution, etc.) that was the follies of a small group of crazy people (see some leaders), almost all Germans, Russians, Japanese, Americans only fought for their countries (it is more in the Nazi Germany I suppose that with all the countries, if you refused to fight because you thought that war was stupid) at that time you were considered a traitor and the punishment was to be shot by treason to the homeland, in this case for betrayal of the reich
They were very hard times, that we all absolutely all must keep in mind
But believe me that apart from the war, there is nothing worse than a civil war like the one we suffered in Spain (something that seems not to interest many people) neighbors killing each other by simple ideology.
My grandparents lived the Spanish civil war first hand (may God have them in their glory), my grandfather fought while my grandmother and other neighbors hid in the subway of Barcelona to take refuge from the bombs ... and it was a horror, the civil war was a horror and a shame for a country, it is the worst that can exist, a civil war