God can do anything He pleases. He can forgive who ever He wishes to forgive. He wouldn’t need to sacrifice His own corporeal Son as a precondition of doing so.
It makes no sense.
The truth is that it doesn't please God to forgive who ever. If God wanted to forgive who ever, then all mankind would have no worry about entering the kingdom of heaven and if they never repent of their evil ways, heaven wouldn't really be heaven. As a just God, that would violate His character. God is a God who abides by the rule of His eternal law and His eternal justice. God's own law is that He is a God of justice.
God the Father did not force Jesus to be a Savior of the world. Jesus was a volunteer. He was the most excellent spirit child of the Father. He was even made a member of the godhead before the world was and was fully aware of what it would take to bring Salvation unto his fellow brothers and sisters. God knew that mankind was imperfect and coming to this earth and experiencing mortality would mean that all mankind would sin and fall short of abiding by the law of His celestial kingdom. According to justice, mankind was not worthy of entering the kingdom of heaven. But God knew this situation would occur and called Jesus as the Savior of the world before the foundation of the world. Along with all that God does, mercy also needs to be an act of justice. The genius of the situation was that God would allow the greatest of all injustices to occur which would require Him to recompense or compensate for the injustice. He would send Jesus to earth and allow him to be inflict with the greatest of injustices upon him as lamb without blemish and spot. What could God recompense a perfect being? Jesus was sinless and already was entitled to be in the kingdom of heaven. God knew that he would need to compensate him with something above and beyond salvation because he was never in need of salvation since he was never a fallen being. The plan before the foundation of this world was that Christ would become a Savior and as his recompense he would be allowed to forgive the sins of fallen mankind based on the doctrine of repentance and sanctification. Jesus was allowed as his recompense to grant forgiveness of sin and sanctify the sinner and cleanse him of his sins if the sinner would repent of his sins and forsake them. Through the gift of the Holy Ghost, mankind could be cleansed and be found worthy again to enter the kingdom of heaven. Through all of this, God could remain a God of justice and mankind could be forgiven and sanctified from sin so that he could enter the kingdom of heaven.
God, according to His own law of justice required that a Savior was needed and that the recompense of his unjust sufferings and the extent of his unjust sufferings would be sufficient to justify the forgiveness of sin based on the sinner repenting of his sins. Many people assume that God can just do anything and can unjustly allow mankind into heaven if he so desires. But God is bound by his own sense of justice and requires mankind to change and God to have a just reason for forgiving past sins of mankind. The recompense of Jesus' undeserving sufferings for all mankind was created to give God a just cause for granting a perfect being the right to forgive sin and to sanctify those who seek after forgiveness and sanctification.
Alma 42:14-24
14 And thus we see that all mankind were fallen, and they were in the grasp of justice; yea, the justice of God, which consigned them forever to be cut off from his presence.
15 And now, the plan of mercy could not be brought about except an atonement should be made; therefore God himself atoneth for the sins of the world, to bring about the plan of mercy, to appease the demands of justice, that God might be a perfect, just God, and a merciful God also.
16 Now, repentance could not come unto men except there were a punishment, which also was eternal as the life of the soul should be, affixed opposite to the plan of happiness, which was as eternal also as the life of the soul.
17 Now, how could a man repent except he should sin? How could he sin if there was no law? How could there be a law save there was a punishment?
18 Now, there was a punishment affixed, and a just law given, which brought remorse of conscience unto man.
19 Now, if there was no law given—if a man murdered he should die—would he be afraid he would die if he should murder?
20 And also, if there was no law given against sin men would not be afraid to sin.
21 And if there was no law given, if men sinned what could justice do, or mercy either, for they would have no claim upon the creature?
22 But there is a law given, and a punishment affixed, and a repentance granted; which repentance, mercy claimeth; otherwise, justice claimeth the creature and executeth the law, and the law inflicteth the punishment; if not so, the works of justice would be destroyed, and God would cease to be God.
23 But God ceaseth not to be God, and mercy claimeth the penitent, and mercy cometh because of the atonement; and the atonement bringeth to pass the resurrection of the dead; and the resurrection of the dead bringeth back men into the presence of God; and thus they are restored into his presence, to be judged according to their works, according to the law and justice.
24 For behold, justice exerciseth all his demands, and also mercy claimeth all which is her own; and thus, none but the truly penitent are saved.
