(b) Private safety from death is not a sufficient reason, if it does not compensate for the loss, or if it is secured unlawfully (see 104). Thus, if Balbus cannot escape from an unjust aggressor without running down and killing an unbaptized infant or a man whose life is very necessary for the community, the temporal life of Balbus does not compensate for eternal life lost by the infant in the first instance, and the mere private good of Balbus does not compensate for the public good sacrificed in the second instance. Again, if Caius cannot escape from drowning without pushing a shipwrecked companion from the only plank which is insufficient for both, or if Sempronius who has been sentenced to death for crime cannot escape execution unless he kills his guard, the means of securing safety are unlawful.
(c) Private safety from death is a sufficient reason, if it compensates for the loss and is secured lawfully. Hence, if the life of the innocent person is only of equal importance, self-defense against an unjust aggressor by means of flight that will involve the innocent person’s death does not make one guilty of homicide (e.g., Titus is speeding in his car in order to escape a pursuer bent on murder and he cannot avoid hitting and killing a cripple who crosses the road). If self-defense is conducted by means of attack, one may use violence against the aggressor (e.g., one may shoot at him, although an innocent person whom he is using as a shield will be killed), but not against the innocent person (e.g., one may not shoot at the innocent person in order to deprive the aggressor of his shield, nor may one hold the innocent person before one in order that he receive the assailant’s bullet).
1848. Destruction of the Unborn.—(a) Direct and intentional destruction of this kind is unlawful and is known as feticide, when the fetus is killed within the womb, or abortion, when a non-viable fetus is expelled from the womb. It is not abortion to hasten the birth of a viable fetus (i.e., one which is about six or seven months old and can live outside the womb), since the child can be kept alive, but grave reasons are required to make it licit, since it presents a risk to the child’s life. But to deliver or expel a non-viable fetus is abortion. Every direct abortion is regarded by the Catholic Church as murder and is penalized with the censure of excommuuication (Canon 2550, Sec. 1). It might be argued that the direct killing of what is surely a human being is murder, but when does the fetus become a human being? The ancient theory of Aristotle, followed by St. Thomas and most medieval authors, maintains that the embryo did not become human until some time after conception, an opinion that still has great probability physically. Others maintain that animation is simultaneous with conception. Since we do not know the exact moment of animation, the moment of conception must be accepted in practice as the beginning of human life. Probabilism is ruled out in this instance, for there is no doubt about the law and its application: we must not directly kill what is probably a human being. Accordingly, abortion is considered to be murder. Hence, even in the case of a girl who has been raped—although it is a probable opinion that measures may be taken to remove the semen from-her body—it would be gravely sinful to give any treatment which would abort an impregnated ovum.
(b) Indirect and unintentional killing, or rather permission of death, is not unlawful in such a case, when there is a proportionately grave reason, such as the life of the mother. Thus, it is permissible to give the mother a remedy necessary to cure a mortal disease (e.g., medicinal drugs, baths, injections, or operations on the uterus), even though this will bring on abortion or the death of the fetus; for the mother is not obliged to prefer the temporal life of the child to her own life. But the baptism of the child must be attended to, for its salvation depends on the Sacrament, and the eternal life of the child is to be preferred to the temporal life of the mother, if the conditions of 1166 are verified.
(c) Contemporary moral opinion considers that in tubal pregnancies (ectopic gestation) the tube itself is in a pathological condition long before rupture of the tube, as experts in obstetrics teach, and hence can be excised as a diseased organ of the human body. As such, the excision of such a tube would be in itself a morally indifferent act and, granting verification of the other conditions for the principle of double effect, could be licitly performed. (For a history of the moral question, medical testimony and full argumentation see Chapter X of _Medical Ethics_ by Charles J. McFadden, O.S.A.) Some theologians, however, believe that the tube cannot be removed unless it can be proved in each case that a pathological condition, placing the woman in danger of death, exists. The first view is accepted as sufficiently safe to be followed in practice. (See Francis J. Connell, C.SS.R., _Morals in Politics and Professions_, p. 118.)
1849. It is unlawful positively to kill the mother in order that the unborn child may be saved or baptized. When a caesarean section offers the sole chance of saving the mother’s life, it is permitted. It is seriously doubtful whether a mother is morally obliged to undergo the operation in situations where a threat to her life exists. In this case, if baptism in the uterus is possible without increasing the danger to the mother’s life, it should be attempted. When a caesarean section does not offer any chance of saving the mother’s life, but will directly contribute to her death, the operation should not be performed. One must await the death of the mother and then observe the norm of Canon 746; “Immediately after the death of a pregnant woman, a caesarean section should be done in order that the fetus may be baptized.” The procedure to be followed is outlined in medical-ethics books. (See McFadden op. cit., pp. 244 ff.)
1850. Direction in Cases of Doubt, Ignorance, or Error.—(a) In case of doubt, if there are positive and solid reasons for believing that an operation performed to save a woman’s life will not be destructive of the life of a fetus, the operation seems lawful; for in doubt, the woman, as the certain possessor of life, has the presumption.
(b) In case of ignorance or error (e.g., when a penitent asks whether a certain operation is permissible, or a surgeon in good faith performs an operation that is not lawful), either a truthful answer should be given to questions, or silence should be observed when an admonition would only be harmful (e.g., if to require the Caesarean operation from a dying mother would have no other result than to make her die in bad faith instead of good faith).
1851. Canonical Penalties for Homicide and Abortion.—(a) Homicide, if voluntary, produces irregularity (Canon 985, n. 4) and subjects the guilty party to exclusion from legitimate ecclesiastical acts or to degradation from the ecclesiastical state (Canon 2354). Moreover, a church is violated by the crime of homicide (Canon 1172). (b) Abortion of a human fetus, when the effect is produced, brings irregularity on those who procure it and also on the cooperators (Canon 985, n. 4). Moreover, those who procure abortion effectively, the mother not excepted, incur excommunication _latae sententiae_ reserved to the Ordinary, and, if clerics, they are to be deposed (Canon 2350).
1852. Suicide.—Suicide, or the killing of oneself, is, like homicide in general, of various kinds.