|This is how political ideology distorts religion.|
Defining Our Terms
First, let’s define our terms. But before we do, let me remind you: Infallibility applies to the Catholic Church only on matters of faith and morals, and only under specific conditions. Individual Catholics, especially lay bloggers, are not infallible. With that caveat:
In Catholic moral theology, sins can be divided into four categories: sins of thought, sins of word, sins of commission, and sins of omission. A sin of omission, according to The Catholic Encyclopedia, is “the failure to do something one can and ought to do. If this happens advertently and freely a sin is committed. Moralists took pains formerly to show that the inaction implied in an omission was quite compatible with a breach of the moral law, for it is not merely because a person here and now does nothing that he offends, but because he neglects to act under circumstances in which he can and ought to act.”
Sins are also classified according to whether they are venial or mortal. “Mortal sin destroys charity in the heart of man by a grave violation of God's law; it turns man away from God, who is his ultimate end and his beatitude, by preferring an inferior good to him. Venial sin allows charity to subsist, even though it offends and wounds it” (Catechism of the Catholic Church § 1855). A mortal sin is committed when the object is grave matter (i.e., a violation of the Decalogue), and when it is committed with full knowledge and deliberate consent (cf. CCC § 1857; see link above).
Material and formal cooperation pertain to the degree that an accomplice actually participates in the sin of the principal agent. Says The Catholic Encyclopedia, “For example, to persuade another to absent himself without reason from Mass on Sunday would be an instance of formal cooperation. To sell a person in an ordinary business transaction a revolver which he presently uses to kill himself is a case of material cooperation.” Formal cooperation pertains, then, when the person assists a person in an evil act freely and in full knowledge of its wrongness. With material cooperation, “the action of the accomplice is assumed to be unexceptionable, his intention is already bespoken to be proper, and he cannot be burdened with the sin of the principal agent since there is supposed to be a commensurately weighty reason for not preventing it.” There is also a distinction between proximate and remote cooperation.