I agree presuppositions are the problem. I had to set aside mine years ago (I also assumed the Penal Substitution Theory correct).These are, as you say, your presuppositions. You should look at the texts that I am constantly bringing forward and you will see that you are applying your presuppositions in an unbiblical way.
Another text that you might find
Your presuppositions are your problem. You are constantly saying that you 'just follow the Bible,' which we all knew you didn't, but now you have finally admitted it. You are holding God to your flawed human understanding of righteousness.
You are stuck on Isaiah 53:10 because you cannot accept what it says so clearly. If you will just accept what the text says, you will find that God is perfectly righteous, but in His way, not necessarily yours.
I will advise you to meditate on two texts of Scripture: Isaiah 55:8-9 and Romans 11:33-36. Another text which will help you is Genesis 50:20, which I gave you in an earlier post: "But as for you, you meant evil against me, but God meant it fot good, in order to save many people alive as it is this day." God actively brought evil into Jospeph's life (Gen. 45:4-5) but for a good purpose, as Joseph came to realise. God is not bound to your fallen definitions of how He should act. You are bound to His righteous demands as to how you should act.
I offered ny definition of divine justice (God's righteousness) in hopes that you would offer yours rather than merely claim my definition is wrong and continue to assert your presuppositions.
I am not the One who said that it is evil to punish the just. I am not the One who said that it is evil to clear the guilty. Your insults ate misplaced as you should have directed them at God for daring to contradict your antiquated humanistic philosophy.
Yes, Joseph's brothers meant their actions against him as evil and God meant it for good. BUT Joseph's brothers did the evil, not God. It was according to God's plan, but God did not sell Joseph. It is the same when Christ suffered the power of Satan. This was God's plan.
In the Bible (that dusty unused book near all of the worn out works by the men you follow) justice includes but is more than a moral law. Dust off your Bible and read it. If you do you will see your mistake rather quickly.