The Church teaches the DP should only be used as a last resort when society cannot be protected from the acts of the criminal by any other means.
This is the current opinion about the appropriate use of capital punishment in today’s society - it does more harm than good. What the Church actually teaches, however, is that the punishment must be commensurate in severity with the severity of the crime and that obligation has nothing whatever to do with the protection of society. By focusing on protection against future crimes the entire concept of securing justice for the crime actually committed is completely lost, but it is justice, not protection, that is the primary objective of all punishment, and it is justice (retribution), not protection, that justifies punishment.
Yet, I’ve read of several cases where a member of a gang would order "hits’ from prison on a rival or the rival’s family.
Clearly the opinion that modern prisons are sufficient to protect society is a position that is impossible to defend against the actual facts of the matter.
I suggest a new capital punishment called “Isolated Life”. … This would truly be a fate worse than death for the most heinous of crimes but would allow for personal redemption should the prisoner so choose.
I’m sure it would be possible to devise punishments that, given the choice, would lead the prisoner to choose death but that’s not really the point either. The issue is to apply the punishment that fits the crime and in the case of murder the Church has been clear on what that punishment should be: the life of the murderer. The Church has always based her position on Gen 9:6 and does not back away from that position even today (see CCC 2260). Regarding repentance, someone even on death row would have years to reach that decision *“And if they are so obstinate that even in the hour of death their heart will not go back upon its wickedness, a fairly probable reckoning may be made that they never would have returned to a better mind.” *(Aquinas)
Finally, and this is a point that is completely lost when the discussion of punishment focuses on security rather than retribution, we have to address the issue of expiation.
"Even death inflicted as a punishment for crimes takes away the whole punishment due for those crimes in the next life, or a least part of that punishment, according to the quantities of guilt, resignation and contrition; but a natural death does not."
A man cannot escape the consequences of his sin and if he is not sufficiently punished in this life he will have to endure punishment in the next. A person sentenced to death, who freely accepts his punishment, erases the debt he owes and enters the next life free of that sin.
Ender