The Middle Ages embodies the grandiose attempt of Western European humanity to build its life on the basis of the highest values, to understand it as a path to certain ideals formulated by Christianity. We are talking about the transformation of human society and world; the purpose was the transition to some supreme state of transformation. The religious basis of this world-view was the doctrine of the incarnation of Christ, which enlightened the material world through the union of the divine and the material element, thereby showing the way to human activity. The real leadership was in the hands of the Catholic Church and was based on the doctrine of the Church as a mystical covenant of believers embracing the living and the dead. Based on this teaching are both the prayers for the dead and the invocation of the saints as various forms of union between members of one single church. 14
Every heretical doctrine that emerged in the Middle Ages had, clearly stated, or in necessary consequence, a revolutionary character, that is, to the extent that it came to power, it had to bring about a dissolution of the existing state, a political and social upheaval. Any gnostic sect, the Cathars and Albigensians, who had actually provoked the hard and inexorable legislation of the Middle Ages against heresy, and had to be fought in bloody wars, were the Socialists and Communists of that time. They attacked marriage, family and property. If they had won, a general overthrow, a sinking back into barbarism and Pagan licentiousness would have been the result. Every connoisseur of history knows that there was no place even for the Waldenses, with their principles regarding oaths and the criminal law of the State in the European world of that time.15 ... Civil society is based on the freedom of citizens. Freedom, however, especially if it is to have lasting existence, has to work under the prerequisite of “order”. But every order is based upon certain convictions and the resulting judgments and values. Therefore, the most promising strategy for overthrowing civil society is to trigger an erosion of the values within it. And that is exactly what the disciples of the Frankfurt School did. The starting point for this erosion of values is anthropology. The Frankfurt School amalgamates Marxism with psychoanalysis into Freudomarxism, which interprets man as a network of rudimentary impulses and as a product of external influences and circumstances, whose happiness consists in the fulfilment of basic needs.
This anthropology calls for a hedonistic society in which sin is not only accepted but even praised. This applies, of course—as already in the heretical movements of the Middle Ages—especially to the sin against the sixth commandment, which is sold to people as a liberation.21 That sin is, of course, the exact opposite of freedom was already known to St. Augustine, who said that a man has as many masters as he has vices. By means of the so-called “sexual revolution”, a lifestyle is made palatable to people in which they consider servitude to be a desirable state of life. The transformation of society into something totally hedonistic, however, also provides the Frankfurt revolutionaries with a means by which they can fight against their most hated social institution, marriage and the family, which they defame as the germ cell of fascism. https://www.catholicworldreport.com/2019/09/05/the-socialist-myth-igor-shafarevich-and-modern-nihilism