Why does abortion result in excommunication, but not other forms of murder?
I am not a canon lawyer, nor a theologian or scholar, but, from my research, the best explanations I can come up with are as follows: while a murderer is not excommunicated, they may be punished by certain “expiatory penalties”, whereas excommunication isn’t so much of a “punishment” as it is a method of persuading the offender to repent.
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Excommunication belongs to the genus of sanctions known as censures, in contrast to expiatory penalties. Expiatory penalties (canon 1336) punish the offender for a prescribed time or an indefinite time and seek to remedy the damage or injustice done to societal values by the offense and to deter others from engaging in similar wrongdoing. In contrast, censures are considered to be “medicinal penalties” (canon 1312, §1, 1º), which means that they seek to persuade the offender to cease the wrongful behavior and reintegrate the person into the life of the ecclesial community. As such, censures are lifted when the offender “withdraws from contumacy,” i.e., from engaging in the wrongful behavior and making suitable reparation for damages, if necessary (see canons 1347 and 1358).
Properly understood in this way as a medicinal penalty, excommunication certainly does not expel the person from the Catholic Church, but simply forbids the excommunicated person from engaging in certain activities (listed in canon 1331) in the life of the Church until the offender reforms and ceases from the offense. Once this happens, the person is to be restored to the fullness of participation in the life of the Church. Although the remission of the censure pertains to the competent authority to determine whether the person has actually withdrawn from contumacy, in a sense the offender holds in his or her own hand the key to the release from the censure. If the wrongful behavior ceases and any necessary reparation or restitution is made, the excommunication will be lifted; if not, it continues.
I am of the belief that the Church in her wisdom has reasons that I am not able fully to explain, and that excommunication may be misunderstood by the majority of the laity.
Peace