Joy, I'm not missing the point, I understand why they brought her to Him, but for you so say Yeshua didn't care about her guilt???
That was/is the foundational reason for the incarnation. John 3:16
And then to say they they disqualified themselves from being prosecutors and executors, may I ask, if that is the case and by your own admission all men are sinners, who then was to accomplish the task way back when, when the commandment was given?
Because Jesus was the Lamb slain from the foundation of the world Rev 13:8 she was already forgiven,
...who makes the dead live, and calls the things which do not exist as though they do exist. Rom 4:17
Paul teaches us that was how God could impute righteousness to Abraham and all of the Old Testament Saints before the Cross, and what about Isiah (Is 6), how could he of been made righteous by the coal from off of the alter that touched his lips before the shed blood of Yeshua was poured on it?
That, Rom 4:17, is the signification and the authority behind and why He could say He didn't condemn her.
My friend, may I humbly suggest you study Rom 4:17, take it before Yeshua in your personal devotional time and let Him explain it to you.
Also it's not the fact that He was sinless that He kept the law, but rather He came as our superhero, the Second Adam, God incarnate, to fulfill the law so that He could Father/create (1 Pet 1:23) another race of humans to spend Eternity with Him solely by the means of Grace.
AND Jesus telling her to go and sin no more was/is the proof that she was/would be born again/regenerated because in the story she addressed Him as Lord- kurios,
...that no one can say that Jesus is Lord, but by the Holy Spirit. 1 Cor 12:3
and since only those that are/will be born again (during this transitional period at the end of the dispensation of the law) are foreknown (Eph 1:4) to Yeshua, He could say to her to Go and sin no more, because He knew He would inspire John to write some 50-60 odd years after this story, for her and us,
Everyone who has been born of God does not commit sin, because His seed remains in him, and he cannot sin, because he has been born of God. 1 John 3:9
We know that everyone who has been born of God does not continue to sin, but the one born of God guards himself, and the evil one does not touch him. 1 John 5:18
Voila, the rest of the story as to why Jesus commanded her to go and why she could go and sin no more, ...may I reiterate,
...who makes the dead live, and calls the things which do not exist as though they do exist. Rom 4:17
Blessing and may the Lord richly bless you today,
Gene