The sons of Perdition are the only ones who are not redeemed by the atoning sacrifice (DC 76:38). This means that although they are resurrected they do not receive a kingdom of glory. They are the only ones whom the mercy of the Lord cannot reach. This is because they have effectively denied the mercies of the Holy One. Therefore, the demands of justice are in force. No one else will feel the power of justice as forcefully as these unfortunate souls. Therefore if that man repenteth not, and remaineth and dieth an enemy to God…mercy hath no claim on that man; therefore his final doom is to endure a never-ending torment (Mosiah 2:38-9).