— Charles Krauthammer American journalist 1950
Context: Communism always had sympathetic Westerners who amounted to a fifth column, including communist parties and intellectuals. Its appeal made it a double threat, internal and external. In the old days, communist parties were on the verge of getting parliamentary majorities in some European countries. That threat doesn't exist with Islam. The fundamentalists have nothing like that demographic or political import, even in Europe. The Muslim population in America is not much fundamentalist, nor radicalized. Rather, it accepts American religious pluralism and lives, like other religions, in a quite harmonious and pluralistic way.
Of all the ideologies remaining in the world in the debris of the collapsed Soviet empire, fundamentalist Islam is the only one that, at least in our lifetime, appears to pose a serious problem to the West. It's the only expressly anti-Western ideology of any importance in the world and it means to destroy the Western position, Western institutions, Western culture, wherever it can. This occurred in Iran, and will happen again in Algeria. Should fundamentalists take power in Egypt, there will be profound geopolitical consequences. A region very important to us will be destabilized, with many problems resulting. Once that happens, we'll be asking ourselves why we weren't worrying about this years ago.
Interview with Charles Krauthammer: America's "Great Success Story", in Middle East Quarterly (December 1994) http://www.danielpipes.org/6305/charles-krauthammer-americas-great-success-story