I think that maybe you are not seeing the law as spiritual.
Jesus brought home to our hearts what adultery really is...lusting after a woman in our heart.
In the ten commandments, God the Father hinted at the spiritual nature of the law. Forst He told us not to steal; and a little bit later He told us not to covet.
He wanted us to meditate on the meaning of the law (Psalms 1).
Those who did, would understand the spiritual nature of the law...
That the outward requirements have a deeper meaning that apply to what is in the heart.
Such as, if you are angry with your brother without a cause; and say to him, "You idiot" or "You fool!" you are in all reality violating God's commandment of "Thou shalt not kill" and are in danger of the council or even of hell fire.
Now, when I speak of the law, I am speaking of every moral tenet in the Old and New Testaments.
In the New Testament, I believe that the law that governs us is exemplified in a set of vices that we are to avoid (Galatians 5:19-21) and virtues that we are to exemplify in opposition to those vices (Galatians 5:22-23). There is no law against such behaviour; so if we live according to these virtues and eschew the vices, we will be law-abiding citizens of the kingdom of heaven.
While it is the purpose of the law to show us that we are sinners in need of a Saviour, I don't think that it is its purpose to cause us to resign ourselves to the fact that we are sinners; and just give up on living a holy life. I believe that once we realize we are sinnerrs, that we need to repent of living a sinful lifestyle and begin to seek the Lord and His provision for living a holy life.
Mat 1:21, And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins.
Tit 2:11, For the grace of God that bringeth salvation hath appeared to all men,
Tit 2:12, Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world;
it 2:13, Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ;
TTit 2:14, Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.
Tit 2:15, These things speak, and exhort, and rebuke with all authority. Let no man despise thee.
Tit 3:3, For we ourselves also were sometimes foolish, disobedient, deceived, serving divers lusts and pleasures, living in malice and envy, hateful, and hating one another.
Tit 3:4, But after that the kindness and love of God our Saviour toward man appeared,
Tit 3:5, Not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost;
Tit 3:6, Which he shed on us abundantly through Jesus Christ our Saviour;
Tit 3:7, That being justified by his grace, we should be made heirs according to the hope of eternal life.