The whole issue rests upon what is the definition of Biblical love and is death a retributive penalty for violation against the love of God. As far as the question, is it just for the righteous to suffer for the unrighteous I simply give Peter's opinion:
1Pe 3:18 For Christ also has once suffered for sins, the just for the unjust, that he might bring us to God, being put to death in the flesh, but quickened by the Spirit:
Note that "for sins" and "for the unjust" includes both the penalty (sins) and the sinners. Note the text also includes both retributive justice (for sins) and restorative justice (that he might brings us to God). There is no either/or as Jon demands but BOTH!
Yes, Jesus suffered once for our sins - the just for the unjust, that he might bring us to God being put to death in the flesh, but quickened by the Spirit.
For you have been called for this purpose, since
Christ also suffered for you, leaving you an example for you to follow in His steps, WHO COMMITTED NO SIN, NOR WAS ANY DECEIT FOUND IN HIS MOUTH; and while being reviled, He did not revile in return; while suffering, He uttered no threats, but kept entrusting Himself to Him who judges righteously; and He Himself bore our sins in His body on the cross, so that we might die to sin and live to righteousness; for by His wounds you were healed. For you were continually straying like sheep, but now you have returned to the Shepherd and Guardian of your souls....
For it is better, if God should will it so, that you suffer for doing what is right rather than for doing what is wrong. For Christ also died for sins once for all, the just for the unjust, so that He might bring us to God, having been put to death in the flesh, but made alive in the spirit; in which also He went and made proclamation to the spirits now in prison, who once were disobedient, when the patience of God kept waiting in the days of Noah, during the construction of the ark, in which a few, that is, eight persons, were brought safely through
the water. Corresponding to that, baptism now saves you—
not the removal of dirt from the flesh, but an appeal to God for a good conscience—through the resurrection of Jesus Christ, who is at the right hand of God, having gone into heaven, after angels and authorities and powers had been subjected to Him.
Jesus is the "Last Adam", and as I have stated over and over again, the atonement is substitutionary - the just for the unjust. Just as Adam represented mankind, so now Christ is the "last Adam". But this is not a righteousness under the Law but one apart from it. You still have not proved, via Scripture, your point.