Philomath
Sadhaka
God does not forgive himself. I believe He forgives humans their sins and saves them from the just penalty of sin, which is death. (Romans 6:23) and he does this while keeping to his own standards of justice. (Job 34:10,11)
He saves them from the penalty that he himself created.
God could have destroyed the rebels as soon as they sinned, in which case we would never have lived at all. Instead, I believe God allowed Adam and Eve to bring forth children to whom God could show mercy. Thus, all of Adam's descendants can potentially benefit from God's undeserved gift of everlasting life.
So instead of punishing the people responsible he instead blames all of humanity for their actions. Allowing Adam and Eve to have children that are essentially "cursed" with sin is not merciful at all.
I believe the Bible teaches God feels emotion just as we do. For example, early in man's history, the wickedness of man made God sad. Genesis 6:6 says of God; "he felt hurt at his heart." Jehovah lovingly provided a legal basis to forgive sins and ransom mankind from sin and death. God would not and did not lower his standards to solve mankind's woeful dilemma. Instead, he gave what was needed to satisfy justice AND provide relief to mankind. However, only those who love God and accept Christ's ransom will benefit from it. As John 3:36 states; "He that exercises faith in the Son has everlasting life; he that disobeys the Son will not see life, but the wrath of God remains upon him."
The christian God could have come up with a much simpler plan and way to rescue humanity from what he already knew that they were going to do...but he didn't. Instead he came up with a convoluted plan that required his son to be sacrficed to him to forgive humans for something that happened centuries earlier.