If God abandons His standard of Perfect, Balanced, Fair, Proportioned Justice He ceases to be a JUST God!
Life isn't just about legalism. You have only taken one aspect of life, and elevated it above the greatest aspect.
Love.
Were it not for love, God wouldn't have even created anything. He didn't need to. He was and is "complete" in every sense.
Why do parents pay their stupid children's bail (for jail)? Out of justice? No. The kid deserves to be in jail by his own merits. But, parents love their children, and do so out of mercy, so that the children won't suffer a horrible fate.
Your analogy fails in the highest and strongest point of morality and life.
Love.