This is what someone else on this forum wrote:
The Catholic Encyclopedia’s entry on socialism is very interesting in this regard. Of course, the historical parts of the entry are incomplete, because it was written before WWI. But the discussion of the ways in which socialism is inconsistent with Catholicism remains applicable.
In sum, the Encyclopedia identifies the following respects in which socialism conflicts with Catholic teaching:
- Socialism is materialistic. “Socialism appropriates all human desires and centres them on the here-and-now, on material benefit and prosperity. But material goods are so limited in quality, in quantity, and in duration that they are incapable of satisfying human desires, which will ever covet more and more and never feel satisfaction.”
- Socialism is deterministic. “Holding that society makes the individuals of which it is composed, and not vice versa, it has quite lost touch with the invigorating Christian doctrine of free will. … Any power which claims to appropriate and discipline [the individual’s] interior life, and which affords him sanctions that transcend all evolutionary and scientific determinism, must necessarily incur Socialist opposition.”
- Because of 2, socialism is hostile to the Church and the family. “Socialism, with its essentially materialistic nature, can admit no raison d’etre for a spiritual power, as complementary and superior to the secular power of the State. … The State was never meant to appropriate to itself the main parental duties, it was rather meant to provide the parents, especially poor parents, with a wider, freer, healthier family sphere in which to be properly parental.”
- Socialism conflicts with the natural law regarding private property. “If man, [according to Aquinas], has the right to own, control, and use private property, the State cannot give him this right or take it away; it can only protect it.”
In other words: “It is true that the institutions of religion, of the family, and of private ownership are liable to great abuses, but the perfection of human effort and character demands a freedom of choice between good and evil as their first necessary condition. This area of free choice is provided, on the material side, by private ownership; on the spiritual and material, by the Christian Family; and on the purely spiritual by religion. The State, then, instead of depriving men of these opportunities of free and fine production, not only of material but also of intellectual values, should rather constitute itself as their defender.”