Fostering hatred of the enemy is a key element of propaganda. Showing enemies as monsters or caricatures, with certain exaggerated physical features, makes them seem less than human. By dehumanizing the enemy, propaganda helped form and maintain public opinion, solidifying a sense of national identity and unity.
The idea that particular ethnic or religious groups or nations did not belong (making them into the “other”) also helped to pave the way for inhumane treatment of the enemy. In Germany, the pervasive use of anti-Semitic propaganda helped set the stage for the Nazis' destruction of Jews in Europe. Japan's propaganda promoted Japanese racial superiority and ridiculed the Allies as "barbarians." In America, prejudice against the Japanese led to the internment of people of Japanese descent—most of them U.S. citizens—depriving them of their liberty and livelihood.
Consider how the portrayal of the enemy in the examples on this page helped further the causes of World War II while promoting racist stereotypes.
Left: Japanese poster showing Churchill and Roosevelt as monsters. (Translation: “The true beasts are those who say ‘peace’ and speak of a just humanity.”)
Center: Anti-Japanese propaganda in the United States.
Right: Axis “brutes”—Adolf Hitler, Benito Mussolini, and Hideki Tojo—on a U.S. envelope.