America and the democratic West faced the European-based totalitarian ideologies of Nazism (National Socialism), Fascism, and Communism, and triumphed over them all. Another totalitarian ideology has arisen in recent decades, this time not in Europe, but the Muslim Middle East, called Islamism. It is a political perversion of Islam, albeit it is rooted in Islamic traditions and scriptures. What makes this 21st Century Islamist totalitarian ideology different from the other destructive ideologies of the 20th century is the adoption of multiculturalism and political correctness (PC) in the democratic West that have tied the West's hands in combatting this evil.
During World War Two, the Western allies did not mince words about the Nazi (German) and Fascist (Italy and Japan) enemies they faced. American G.I.'s knew exactly who the enemy was, and so did the home front, which supported its fighting men and women. The American government helped define the nature of the enemy to the general public. The British and Commonwealth governments did the same.
In the cultural sphere, Broadway and Hollywood, as well as the existing media (printed press and radio), supported the war efforts and helped define the enemy America was fighting. And although the leftist influence in academia was growing as early as the 1940s, the culture in general respected patriotism, religious values, and traditions.