A really good look at Naziism & the other totalitarian regimes & philosophies is Paul Johnson's
Modern Times (world hist from 19-teens to 1990s).
What I found amazing was the way post-WWI Germany (Weimar & Nazi) worked so closely with the USSR right up until Hitler invaded the USSR. The Hitler-Stalin pact was not an aberration, it was a perfectly reasonable outcome, given the previous history.
Also, how the various totalitarian regimes' atrocities played off each other and provided (bad) examples to emulate. Talk about a feedback loop.
One common theme ran through Naziism, Leninism/Stalinism, Italian facism, and Franco's Spanish regime: they all played the "apolitical" card. As in, "We're sick of politics and want to get done what ought to be done!" type rhetoric. Lord save us from the "apolitical" and "bipartisan" types.
Getting back to the German population, they bought the line and supported the Nazi regime. They were all in favor of Hitler bullying their neighbors and getting territory & concessions on the cheap (Alsace-Lorraine, Sudetenland/Czechoslovakia, Austria, Versailles tossed, etc). They also didn't have a problem with the Nazi social engineering & all the horror that entailed. However, they did not want a long, drawn-out war. For instance, the population was not happy with the Polish invasion & the invasions of France, Russia, etc. Too late for them, they had ceded the Nazis too much power for it to make a difference. Hitler knew this & clamped down even harder with his terror apparatus. He did not trust the population to be in line without some "persuasion." He had his goals and he would drag Germany along with him, at that point.
Another look at the way some Germans went along with the Nazi program is
Hitler's Willing Executioners. It smashes the argument that German conscripts had no choice but to murder the populations of "undesireables," as participation in the units that prosecuted that policy was
voluntary. Many sought work in the German army elsewhere. There were, however, plenty of other volunteers to fill the ranks.