I can appreciate your feelings about this however Rev. 21:4 says that sort of sentimentality will be no more. Believing parents, just like the believing martyrs, will understand the just and righteous judgments of God and worship Him for it. Satan is a spirit being and the antichrist and false prophet are humans. That does not take away from the clear and explicit statement that they, not just Satan, will endure torment for ever and ever. Rev. 20:15 says that all those not found in the book of life will suffer the same fate; those are humans also.
Revelation 21:4 indeed says that the old order of things has passed.....except, I guess, in your ever burning "Hellfire".
The wicked will experience eternal death because death is the most merciful fate a loving God could impose on those who insist on breaking his law and reaping the resulting unhappiness. They will be put out of their misery and not make others miserable either. [Revelation 21:8][Psalm 37:20] [Romans 6:23]