But sinners don’t exactly like being in incomprehensible pain… In a way, they aren’t really asking for hell…
God gives us countless graces in our lives that we might come into a relationship with Him and follow the guidance of His Church. It is such that if through all of God’s grace, we still refuse to follow Him, it is our own fault.
Those who end up in hell, are asking for it. maybe not explicitly, but by rejecting God, they have nowhere else to go but to hell. In the end, they would prefer to be there than in God’s presence, as it would be even more painful for them.
Was it someone in this thread, or somewhere else, that quoted C.S. Louis, saying the gates of hell are locked from the inside? I like that description. It might be a horrible place, but even if they got the chance, people there would continue to choose it rather than reject their sins, repent, do penance, and accept God as their master.
If you doubt the infinite mercy of God, please read The Diary of St. Faustina. It is so plain to see through her writings.
Rather than worry about the justice of hell, why not just put your trust in God, whom you should know is infinitely just but also infinitely merciful and loving, and pray for the grace to grow in holiness. God will not deny those who humbly ask for His mercy.