I have now replied to your post in the other thread you have started, so I can have a go at this one while I have time.
To answer you last question first, the context of Justin's reply to Trypho needs to be considered, as I did in my post on the subject:
Trypho recognizes that the Christ must suffer, but he cannot bring himself to believe that He would be crucified, since the OT law teaches that anyone crucified is under God's curse (Deut. 21:23):
'Then Trypho remarked, "Be assured that all our nation waits for Christ; and we admit that all the Scriptures which you have quoted refer to Him. Moreover I do admit that the name of Jesus, by which the son of [Nun] was called, has inclined me very strongly to adopt this view. But whether Christ should be so shamefully crucified, this we are in doubt about. For whoever is crucified is said in the law to be accursed, so that I am exceedingly incredulous on this point. It is quite clear, indeed, that the Scriptures announce that Christ had to suffer; but we wish to learn if you can prove to us whether it was by the suffering cursed in the law' [Sect. 89]
Justin begins by assuring Trypho that Christ was not cursed for His own sins: 'Though a curse lies in the law against persons that are crucified, yet no curse rests on the Christ of God, by whom all that have committed things worthy of a curse are saved' [sect. 94]
'For the whole human race will be found to be under a curse. For it is written in the law of Moses, "Cursed is everyone that coninueth not in all things that are written in the book of the law, to do them." And no one has accurately done all, nor will you venture to deny this........But if those who are under the law appear to be under a curse for not having observed all the requirements, how much more shall all the nations appear to be under a curse who practise idolatry, who seduce youths, and commit other crimes' [sect 95]
Then Justin reaches the crux of his argument, where he explains that the reason why our Lord was crucified is that the curse which rested on us for our sin was transferred to Him.
'If then, the Father of all wished His Christ for the whole human family to take upon Him the curses of all, knowing that after He had been crucified and was dead, He would raise Him up, why do you argue about Him, who submitted to suffer these things according to the Father's will, as if He were accursed, and do not rather bewail yourselves?' [sect 95, emphases added]
This amounts to a clear statement of penal substitution. Although Christ was innocent, He bore the curse due to sinful humanity, enduring in His death the punishment due to us.
Now if you accept that, but blanch at the idea of God's wrath, how do you cope with Psalm 95:11: 'So I swore in My wrath, "They shall never enter My rest" ? Here is God's wrath against sin causing Him to lay a curse upon that generation of Israelites: "They shall never enter My rest." But there is equally a curse upon all mankind: "Cursed is everyone that coninueth not in all things that are written in the book of the law, to do them." And as Justin says, 'no one has accurately done all....,' that is, no one has kept God's law properly, therefore all people are justly under the wrath of God and if Christ does not bear that wrath on their behalf they must bear it themselves.
I do not believe that you and Justin martyr are in agreement; I believe that his use of Deut 21:23 shows that he believes that Christ has borne the curse upon sinful mankind and has therefore borne God's wrath, not against Him, but against sin, for Christ was made sin for us. Justin Martyr has long since gone to his reward, and I cannot cross-examine him as I can you, but I am quite certain from his writing here that he understood that bearing the curse of God due to sinful humanity means bearing the wrath of the God who issued the curse.