From what I read about Nazi Germany, going into all-out war with other powers was very unpopular in 1939. Ordinary Germans supported Anschluss of Austria or Sudetenland, but did not want to risk another big war for Poland of all things.

But in a totalitarian regime, consent of the governed did not matter much. Expressions of pacifism would land you in a concentration camp really quick.

Democracies care a little more about what the average Joe thinks, even though they are far from perfect in this regard and consent can be sorta-kinda manufactured.