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None of my film professors ever said that 1950's horror movies were about Communism, and I would have deserved an F if I'd said so in a paper of my own. Horror films of the '50's were about venereal disease, isolation, fear of technology, fear of the rise of post-war corporate culture, unease about the slow pace of demilitarization of American culture, fear that America would NEVER demilitarize following the war, and so on. and sure, Commies, too, if you insist.
Cloverfield, and by extension, contemporary horror movies, are about much more than just fear of Terrorism. We have a long list of nightmares these sorts of films adress - just as long as that of our grandparents.