Critical Theory was essentially destructive criticism of the main elements of Western culture, including Christianity, capitalism, authority, the family, patriarchy, hierarchy, morality, tradition, sexual restraint, loyalty, patriotism, nationalism, heredity, ethnocentrism, convention and conservatism.
Critical Theorists recognized that traditional beliefs and the existing social structure would have to be destroyed and then replaced with a “new thinking” that would become as much a part of elementary consciousness as the old one had been. Their theories took hold in the tumultuous 1960s, when the Vietnam War opened a Pandora’s Box of reevaluaton and revolution. The student radicals of the era were strongly influenced by revolutionary ideas, among them those of Herbert Marcuse, a member of the Frankfurt School who preach the “Great Refusal,” a rejection of all basic Western concepts and an embrace of sexual liberation, and the merits of feminist and black revolutions. His primary thesis was that university students, ghetto blacks, the alienated, the asocial, and the Third World could take the place of the proletariat in the coming Communist revolution.
Marcuse may be the most important member of the Frankfurt School in terms of the origins of Political Correctness, because he was the critical link to the counterculture of the 1960s. His objective was clear: “One can rightfully speak of a cultural revolution, since the protest is directed toward the whole cultural establishment, including morality of existing society.”
When addressing the general public, contemporary advocates of Political Correctness – or Cultural Marxism, as it might just as easily be called – present their beliefs with appealing simplicity as merely a commitment to being “sensitive” to other people and embracing values such as “tolerance” and “diversity.”
The reality is different. Political Correctness is the use of culture as a sharp weapon to enforce new norms and to stigmatize those who dissent from the new dispensation; to stigmatize those who insist on values that will impede the new "PC" regime: free speech and free and objective intellectual inquiry.