Not all of them were bent on world domination. Hitler basically brainwashed the people. Ever since the end of WWI Germany (and the rest of Europe for that matter) were in a deep depression, one much worse than the American great depression and one that lasted much longer. After WWI Europe was devastated. The allies demanded that Germany pay war debts to the allied forces, but it had no money to do so. The people in Germany were starving and had little or no work. Hitler promised them that if he came to power, he would get them out of depression, give them food, and Germany would become the 3rd power or empire (3rd Reich) for 1000 years. The people were desperate to have better lives, and went along with pretty much anything he said. The common soldier did not know what Hitler was really trying to do, they were brainwashed by the thought of becoming a prosperous country and to get out of debt. Hitler blamed the hardships of Germany on the Jews, and that is why he killed so many of them, and since the German people were so loyal to this man who promised them prosperity, they too hated the Jews. Not all of the German people wanted world domination, or to even take over Europe. Most were just going with the flow, hoping to become a prosperous country once again.
They were also not all part of the Holocaust. Like I said, they were desperate to get out of depression. Hitler blamed Germany's hardships on the Jews, and so the people went along with it. The common soldier had no idea of what Hitler's plans were, many were just frontline soliders doing the dirty work.
I'm not supporting Hitler, or the Nazi party, I'm just pointing out what really happened. People need to understand what really happened.