My argument assumes that Jesus is God. DCM = divine command morality.
1 No rational being wants to suffer excruciating pain
2 God is rational
3 If God determines morality/justice then God could sovereignly decide to forgive our sins without suffering excruciating pain
4 God suffered excruciating pain for the stated reason of forgiveness of our sins
C God does not determine morality/justice
If God determines morality/justice, then it seems to me the cross was gratuitous suffering.
This argument has implications for both ethics and the atonement.
What do you think?