From Pope St. John Paul II’s Apostolic Exhortation Reconciliatio et Pænitentia (1984):
The third meaning of social sin refers to the relationships between the various human communities. These relationships are not always in accordance with the plan of God, who intends that there be justice in the world and freedom and peace between individuals, groups and peoples. Thus the class struggle, whoever the person who leads it or on occasion seeks to give it a theoretical justification, is a social evil. Likewise obstinate confrontation between blocs of nations, between one nation and another, between different groups within the same nation all this too is a social evil. In both cases one may ask whether moral responsibility for these evils, and therefore sin, can be attributed to any person in particular. Now it has to be admitted that realities and situations such as those described, when they become generalized and reach vast proportions as social phenomena, almost always become anonymous, just as their causes are complex and not always identifiable. Hence if one speaks of social sin here, the expression obviously has an analogical meaning. However, to speak even analogically of social sins must not cause us to underestimate the responsibility of the individuals involved. It is meant to be an appeal to the consciences of all, so that each may shoulder his or her responsibility seriously and courageously in order to change those disastrous conditions and intolerable situations.
Having said this in the clearest and most unequivocal way, one must add at once that there is one meaning sometimes given to social sin that is not legitimate or acceptable even though it is very common in certain quarters today.74 This usage contrasts social sin and personal sin, not without ambiguity, in a way that leads more or less unconsciously to the watering down and almost the abolition of personal sin, with the recognition only of social gilt and responsibilities. According to this usage, which can readily be seen to derive from non-Christian ideologies and systems—which have possibly been discarded today by the very people who formerly officially upheld them—practically every sin is a social sin, in the sense that blame for it is to be placed not so much on the moral conscience of an individual, but rather on some vague entity or anonymous collectivity such as the situation, the system, society, structures or institutions.
Whenever the church speaks of situations of sin or when she condemns as social sins certain situations or the collective behavior of certain social groups, big or small, or even of whole nations and blocs of nations, she knows and she proclaims that such cases of social sin are the result of the accumulation and concentration of many personal sins. It is a case of the very personal sins of those who cause or support evil or who exploit it; of those who are in a position to avoid, eliminate or at least limit certain social evils but who fail to do so out of laziness, fear or the conspiracy of silence, through secret complicity or indifference; of those who take refuge in the supposed impossibility of changing the world and also of those who sidestep the effort and sacrifice required, producing specious reasons of higher order. The real responsibility, then, lies with individuals.
A situation—or likewise an institution, a structure, society itself—is not in itself the subject of moral acts. Hence a situation cannot in itself be good or bad.
At the heart of every situation of sin are always to be found sinful people. So true is this that even when such a situation can be changed in its structural and institutional aspects by the force of law or—as unfortunately more often happens by the law of force, the change in fact proves to be incomplete, of short duration and ultimately vain and ineffective—not to say counterproductive if the people directly or indirectly responsible for that situation are not converted.
74 Cf Sacred Congregation for the Doctrine of the Faith: Instruction on Certain Aspects of the Theology of Liberation Libertatis Nuntius; August 6, 1984, IV, 14-15: Acta Apostolicæ Sedis 76 (1984), 885f.
— Reconciliatio et Pænitentia 16