From Hermann Goering, Adolf Hitler’s Rich-Marshall at the Nuremberg Trials after WWII:
Naturally, the common people don’t want war, but after all it is the leaders of a country that determine 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’s worked for many centuries; it will undoubtedly work for many more.