Moral Responsibility

“It is a grave duty of conscience not to cooperate, not even formally, in practices which, although permitted by civil legislation, are contrary to the Law of God. Such cooperation in fact can never be justified, not by invoking respect for the freedom of others nor by appealing to the fact that it is foreseen and required by civil law. No one can escape the moral responsibility for actions taken, and all will be judged by God himself based on this responsibility.”

~The Compendium of the Social Doctrine of the Church (page 172)