- 2260: “For your lifeblood I will surely require a reckoning… Whoever sheds the blood of man, by man shall his blood be shed; for God made man in his own image.” “This teaching remains necessary for all time.” CCC last amended 2003
That God requires a divine reckoning does not translate to the power of divine reckoning to mere men.
In principle, guilt calls for punishment. The graver the offense, the more severe the punishment ought to be. In Holy Scripture, as we have seen, death is regarded as the appropriate punishment for serious transgressions. Thomas Aquinas held that sin calls for the deprivation of some good, such as, in serious cases, the good of temporal or even eternal life. By consenting to the punishment of death, the wrongdoer is placed in a position to expiate his evil deeds and escape punishment in the next life. After noting this, St. Thomas adds that even if the malefactor is not repentant, he is benefited by being prevented from committing more sins. Retribution by the State has its limits because the State, unlike God, enjoys neither omniscience nor omnipotence. According to Christian faith, God “will render to every man according to his works” at the final judgment (Romans 2:6; cf. Matthew 16:27). Retribution by the State can only be a symbolic anticipation of God’s perfect justice.
For the symbolism to be authentic, the society must believe in the existence of a transcendent order of justice, which the State has an obligation to protect. This has been true in the past, but in our day the State is generally viewed simply as an instrument of the will of the governed. In this modern perspective, the death penalty expresses not the divine judgment on objective evil but rather the collective anger of the group. The retributive goal of punishment is misconstrued as a self-assertive act of vengeance. - Card. Dulles.
The civil authorities are authorised by and beholden to the common good. Through this commission they are a symbolic example of Gods perfect justice. They remain bound and committed to act in the interests of the common good in order to be legitimate and moral.
- St. Thomas Aquinas: “If a man is a danger to the community, threatening it with disintegration by some wrongdoing of his, then his execution for the healing and preservation of the **common good **is to be commended. Only the public authority, not private persons, may licitly execute malefactors by public judgement. Men shall be sentenced to death for crimes of irreparable harm or which are particularly perverted.” Summa Theologica, 11; 65-2; 66-6.
Aquinas qualifies legitimate execution with " If a man is a danger to the community". Community safety and the common good is the ultimate goal of all civil punishment.
and so on and so on.