Is divine punishment a release valve for divine wrath?
No. From a Catholic perspective, there is no such thing as literal divine wrath. As you have been saying within this thread, we agree that wrath is a human emotional state, while one of God’s attributes (His impassibility) precludes Him from experiencing anything like human emotion. Anyone interested in the Catholic view of God’s impassibility, please read here:
Aquinas on Divine Impassibility
We Catholics generally understand anthropomorphic language with respect to the Godhead as a feeble attempt to convey divine mysteries to human understanding. For instance, we pray in the creed that Christ is “seated at the right hand of the Father,” but we do not mean that Christ is literally sitting at the Father’s right hand, because (a) God is a spirit without hands, and (b) an eternal sitting would be a weariness of the Lord’s hindquarters. Whenever we encounter expressions of “divine wrath” in scripture, we usually recognize these as a merely human manner of conveying an inexpressible mystery. The “punishment” that we sinners experience in life (and death) because of sin seems or feels like “divine wrath” to us. God, however, is completely, infinitely at peace.
The same is true of divine punishment. Catholic teaching recognizes two types of punishment for sin, temporal and eternal. As the catechism frames it, “these two punishments must not be conceived of as a kind of vengeance inflicted by God from without, but as following from the very nature of sin” (Catechism of the Catholic Church #1472). In the Catholic view, acts have consequences. It’s that simple. Every thought, feeling, word, or deed yields consequences in the life of the soul. Each soul is born free and is constantly shaping itself and its destiny as it either freely cooperates with God’s grace or freely refuses to cooperate.
As you probably know, Protestant soteriology posits more of an “either / or” scenario.
Either salvation is 100% grace,
or it is 100% man’s work, or perhaps (according to some Protestants) we poor benighted Catholics think that salvation is a 50/50 joint venture between God and man. This tension in Protestantism is reflected in the antagonism between Calvinism and Arminianism, both of which are supportable from scripture. The Calvinist has his proof texts. The Arminian has his. Neither can convince the other.
It might be said that we Catholics accept both positions. For us, salvation is “both / and” rather than “either / or,” but
not 50/50. Salvation = 100% God’s grace + 100% man’s cooperation, a divine mystery transcending human reason, just as Christ = 100% God + 100% man. It is inconceivable to the ungraced mind how Christ could have two natures (both divine and human), or two wills (both divine and human), or how salvation could require all of God’s initiative and all of man’s response. For us, faith simply trusts where reason falters.
Does punishment restore God's honor?
Yes. From a Catholic perspective, punishment restores God’s honor where God’s honor is understood as equivalent to His justice, especially in relation to humankind and the rest of creation. Of course, God’s honor considered in and of itself can be neither diminished nor restored. It is a property innate to God. But in the formula of Anselm, honor is defined as “rendering what is due to Whom it is due,” which is also the Catholic definition of justice.
Now, obedience is the thing that is due to God - obedience at all times and in all things. Man’s obedience establishes a sort of balance in the universe, where everything is as it should be. Sin, the failure of man to render to God His due, upsets that balance. Temporal punishment resulting from sin helps reestablish the balance.
Consider the sin of fornication. A single act of this can produce a surprisingly great variety of unhappy results. For my purposes, I will choose a fornicator’s contraction of a venereal disease. Here, the “punishment” (contraction of disease) is but a natural consequence of the sin, probably what Saint Paul describes as “the due penalty for their perversity” (Rm 1:27). Even if the newly diseased fornicator fails to see the disease as divine punishment, it is nevertheless a kind of divine
mercy. If the fornicator has any sense of moral responsibility, he or she will severely curtail his or her lust for fornication, knowing that there is now the possibility of spreading this disease. Or maybe the fornicator has no regard for others and continues to fornicate and spread disease. Well, at some point, at least a few fornicators who become infected must surely begin to restrain their activities. Hence, venereal disease, this “punishment” for fornication, has a way of restraining sin in the population.
If the disease is actually recognized as a divine mercy,
then it can lead to conversion and thankfulness, greatly honoring or glorifying God.
Eternal punishment, in contrast to the temporal, serves no clear purpose, as far as I have heard. It is simply the ultimate result of a long string of bad decisions on the part of individuals. Some have said that the sight of sinners suffering in hell will serve to magnify the praise of God’s mercy among His saints in heaven, but this seems doubtful. However, eternal punishment in hell
can be seen as infinitely more merciful than utter destruction of a soul.
Think of it this way. God is complete in Himself, infinitely perfect, having no need to create anyone or anything. He is also love. Love itself. Father loving the Son, Son loving the Father, Spirit being the love that flows between Father and Son. This infinitely perfect love by His very nature spontaneously flows outwards into infinity and, because He wants to share His wonderful self-experience, intends to create a human soul, an Adam. My first choice, if I were God, would be to self-replicate. I am perfect after all. If one of me is perfectly awesome (or three of me), then surely two of me (or six of me) would be even more perfectly awesome!
The trouble with self-replication is bound up with the one thing that God cannot do. God cannot deny Himself. Well, He is infinite, and there can only be one infinity, as infinity by definition is literally everything. God cannot self-replicate.
What He can do, however, is manifest Himself in infinite variety. That is why we experience a hierarchical universe with everything from the vastness of the sun, moon, and stars, to the tiny single-celled organism and subatomic particle. The universe is God’s expression of infinite self-reflection.
If God is not a tyrant (and we believe that He is not), then He would probably be considerate enough to ask His creature’s opinion about being created. You know, sort of, “Hey, Adam. I’m thinking of creating a hierarchical universe with you as man on the top rung of the visible ladder, but I’m going to allow all human souls to act freely, and that freedom is going to result in loads of sin and death and a whole lot of misery, especially for Me personally in the life of my Son. Anyway, I wanted to ask if you’d like to participate in my creation. It could turn out badly for you if you make poor decisions, but it could also turn out really great if you accept My redemption, which I’m going to freely offer you and everyone.” That’s a sweet idea, but also impossible. In order to have that or any conversation with Adam, God has to go ahead and create Adam.
Yet, we can view our lives here as God’s attempt to have just such a conversation with us. In fact, that’s kind of what we Christians believe life is. Life is God speaking to and with us, and our shutting him out or either hearing and responding positively. God is saying, “I have today set before you life and good, death and evil. If you obey the commandments of the Lord, your God, which I am giving you today, loving the Lord, your God, and walking in his ways, and keeping his commandments, statutes and ordinances, you will live” (Dt 30:15-16). But He also declares Himself “a consuming fire” (Heb 12:29). Love is an all-consuming fire. Either we burn in and with Him, or we experience Him as a burning hell.
This is more merciful than utter destruction because, as Aquinas demonstrates, existence is better than nonexistence. We had to begin to exist in order for God to converse with us. If we reject what He says, we might think it would be more merciful for Him to annihilate us than to punish us forever, but that’s because we don’t have a proper understanding of what annihilation truly means. Also, it is impossible for God to radically destroy anything that He has brought into existence, because anything that exists does so only by virtue of participation in Him. “In him we live and move and have our being” (Acts 17:28). He cannot deny Himself, so nothing in Him will be destroyed. Transformed, yes. Destroyed, no.
Are there any better ideas out there of what punishment is or does?
In my opinion, no. There are just alternate ways of viewing the same balancing act. One of my favorite renditions is found in
The Great Divorce by C.S. Lewis. In that book, everyone in hell is there by their own choice. They are allowed to take excursions to the outskirts of heaven, but most never bother. They’re simply not interested. Lewis describes the bus ride of a few curious souls and how, upon arrival, they all carry on the same way up there as they had down below; thus, none can be convinced to enter heaven. The reader comes away with the impression that heaven is always open to all souls for all time, and it is simply the hardheartedness of souls that shuts them out. It's a short book. You can listen on YouTube set to high speed and get through pretty quickly
HERE.
Is divine punishment necessary?
Yes.
If so, why?
Law. Cause and effect.
See also:
St. Anselm on Seeking Satisfaction and Mercy
Does God Punish Us for Our Sins?
Eternal Punishment