The Church has never EVER declared a person in Hell. Except one. Lucifer. Not Judas, not HItler, not my grandma. BUT the Church does tell is who is NOT in hell. These are the saints, the ones who are declared infallibly by the CHurch to be in heaven. Not purgatory, not hell, but heaven. The Church has never declared a non Catholic to be in heaven. And the Church has had the advantage of many many years of retrospect of people who were a part of salvation history, especially those who lived with and followed Jesus. The Roman soldier, Longinus, who pierced the side of Jesus is a Saint. Peter, who denied Jesus, is a Saint. Paul, who killed Christians and by extension, Christ, Is a Saint.
Jesus, Himself tells us, and tells us often, that people will go to hell. So, hell is populated. THis we know from scripture. What we do not know is the identity of a single person in Hell. I suppose, under the power of binding and loosing and the gift of the keys, The Church would have authority to declare a person in Hell. But at what gain? At what theological purpose?
As I have always stated, ONLY GOD HAS THE POWER TO DECLARE SOMEONE IN HELL. He could have done this scripturally or through His Holy Church. He has not.
However, it can be theologically beneficial and correct for someone to have the BELIEF that someone like Judas is in hell. It may play into a theological view of God’s ultimate JUSTICE. It may play into a theological view of Catholic repentance, that sorrow and pity are not enough. IT may play into a view of scripture that while Jesus said that we must eat his Body and Blood and we take that literally, perhaps we should take literally the threat of Hell and the reality of it. Perhaps, when a pro life faith, has a scripture about a certain person should not have been born, we should sit up and take notice.
A catholic can certainly believe that Judas is most likely in Hell, A catholic can also take the view that at the last second when he hung himself in plot of land he did, the last thing that went through his mind was a perfect contrition. Both are valid views. I agree with one more than another, but no matter what I think, I cannot influence the outcome of Judas’s eternity. Unless I suppose you want to gain a full indulgence from the Church, for the purpose of Judas to get Him out of purgatory.

I’m sure some wonky person has already done this.

So, either Judas is in heaven, right next to Jesus, or he is in Hell. My theological view has nothing to do with his eternal salvation at all. But it can be beneficial.
Both views can be good and bad.
Judas is in hell.
Good: God’s Justice is indeed perfect. And mercy is also perfect. God will protect the Just and keep all order in the universe. By extension, a rapist who gets away with it on earth will still face a judgement.
I should go to confession, and not only be sorry for my sin, but truly be forgiven. I should follow peter and not Judas and go on to live and die for my Lord.
Bad. We run the risk of putting ourselves in God’s shoes and declaring a brother damned. Not just judas, but anyone.
We also can lose hope which is not a good thing. We can think, bad people like Judas go to hell, there is no hope for me.
Judas is saved.
Good: Anyone, is saveable. There is hope for even the most wicked on earth including me when I fail. No matter what I do, there is a path back. God has perfect mercy and can undo even the most horrendous sin.
Bad: Hell is not a danger. All I must do is be sorry for my sin and I am fine. Hell is not a reality, not even the worst traitors go there so I need not make time to go to confession and clean the mortal sin from my soul.Heck, there is no mortal sin. There is always the idea of invincible ignorance or an illness to excuse evil. Humans free will is ordered to always choosing the good. Baptism, and the Church are not necessary. OR worse, I can start identifying and using Judas as a viable way to get to heaven, I can canonize him by misusing the verse of “Judge not” and ignoring the verse of" Better that he not be born"
It would seem most Christians historically have sided with Judas being in hell on this issue, it would seem that the easiest and most logical conclusion when weighing what we know about scripture, Judas, Heaven and hell. BUt it is certainly an issue that we can have differing views on, without accusing others of being “judgemental” or “relativists”
I cannot declare Judas in hell. And I will be judged by the same measurement Judas was. In my view, my 100 percent catholic view, I believe Judas to be in hell. I will not pray for his intercession and I will not pray for his soul as I believe it is futile. Could I be wrong? Sure. But if Judas is not damned and is in fact in heaven, then I doubt I will be in hell for my purely Catholic understanding of scripture, good, bad, justice and injustice and mercy.
We have angels that are saints. Michael…, etc. And we have a declaration of a person in hell. Lucifer. We know that other demons reside there as well. We know that humans will go to hell. We know that Jesus wills each of us to be born, and that he wants salvation for all… We know that some will betray our Lord, Ignore Our Lord and sell our Lord to the accusers for profit, We know that if we do this, we would be in danger of Hell. If we die with even one mortal sin on our soul, we will join satan in Hell. We know that the CHurch so recognizes this danger that she mandates we go to confession at least once a year. Pope or Pauper, She protects all of us by mandating the sacrament of baptism and confession. We should listen to Her, we should listen to God himself in the scriptures and we should not betray our Lord and follow our pride to our death, but rather like Peter, return to Him, feed his sheep, and die in service to the Gospel and Him.