You seem to be using your words and not scripture, what does scripture say is the law that defines sin...
In the bible they use principles, when quoted from the Ten it means all -James 2:10-12 Mat 5:19-30 just like when one of the greates commandments is only quoted it means both.
What law is being quoted to define sin? The Ten Commandments which is why it is under the mercy seat in God's heavenly Temple Rev 11:19 and what the earthy temple was patterned after Hebrews 8:1-5
Romans 7:7 What then shall we say? That the law is sin? By no means!
Yet if it had not been for the law, I would not have known sin. For I would not have known what it is to covet if the law had not said, “You shall not covet.”
I trust Jesus is a reliable and believable source? He quotes from the Ten Commandments stating if we break we are in fear of sin and judgement and said not to break or teach others to break the least of these and in doing so one would be least in heaven and if you compare that to His teachings on the Ten Commandments in Matthew 15in doing so one falls in a ditch, means off the narrow path. Here Jesus is applying the Ten Commandments to our thoughts and feelings as that is where sin starts.
Matthew 5:21
“You have heard that it was said to those of old, ‘You shall not murder, and whoever murders will be in danger of the judgment.’ 22 But I say to you that whoever is angry with his brother [
e]without a cause shall be in danger of the judgment. And whoever says to his brother, ‘Raca!’ shall be in danger of the council. But whoever says, ‘You fool!’ shall be in danger of [
h]hell fire. 23 Therefore if you bring your gift to the altar, and there remember that your brother has something against you, 24 leave your gift there before the altar, and go your way. First be reconciled to your brother, and then come and offer your gift. 25 Agree with your adversary quickly, while you are on the way with him, lest your adversary deliver you to the judge, the judge hand you over to the officer, and you be thrown into prison. 26 Assuredly, I say to you, you will by no means get out of there till you have paid the last penny.
Matthew 5:27 “
You have heard that it was said to those of old, ‘You shall not commit adultery.’ 28 But I say to you that whoever looks at a woman to lust for her has already committed adultery with her in his heart. 29
If your right eye causes you to sin, pluck it out and cast
it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell. 30 And if your right hand causes you to
sin, cut it off and cast
it from you; for it is more profitable for you that one of your members perish, than for your whole body to be cast into hell.
This really can't be more clear! The Ten Commandments is what defines sin the law that came because of sin until the Seed would come is animal sacrifices as it always pointed forward to Christ because the blood of animals could not take away the sins of the world but the blood of Christ is PERFECT for cleaning us of all sin and unrighteousness 1 John 1:9 but many do not take Christ up on His free offer but prefer staying in darkness (sin) instead of coming to the light (truth), when Jesus came to free us of the bondage of sin and walk with Him in His righteousness. The Ten Commandments is called the law of liberty because one is free of sin and that bondage James 2:10-12
This is the law that ended, not what defines sin, God's eternal commandments that reflects His very character.
Hebrews 9:11
But Christ came as High Priest of the good things [c]to come, with the greater and more perfect tabernacle not made with hands, that is, not of this creation. 12 Not with the blood of goats and calves, but with His own blood He entered the Most Holy Place once for all, having obtained eternal redemption. 13
For if the blood of bulls and goats and the ashes of a heifer, sprinkling the unclean, [d]sanctifies for the [e]purifying of the flesh, 14
Hebrews 10:1 For the law (animal sacrifices)
, having a shadow of the good things to come,
and not the very image of the things,
can never with these same sacrifices, which they offer continually year by year, make those who approach perfect. 2 For then would they not have ceased to be offered? For the worshipers, once [a]purified, would have had no more consciousness of sins. 3 But in those sacrifices there is a reminder of sins every year. 4 For it is not possible that the blood of bulls and goats could take away sins. 5 Therefore, when He came into the world, He said:
“Sacrifice and offering You did not desire,
But a body You have prepared for Me.
6 In burnt offerings and
sacrifices for sin
You had no pleasure.
7 Then I said, ‘Behold, I have come—
In the volume of the book it is written of Me—
To do Your will, O God.’ ”
8 Previously saying, “Sacrifice and offering, burnt offerings, and
offerings for sin You did not desire, nor had pleasure
in them” (which are offered according to the law), 9 then He said, “Behold, I have come to do Your will, [
b]O God.” He takes away the first that He may establish the second. 10
By that will we have been [c]sanctified through the offering of the body of Jesus Christ once for all.
This truly cannot be any clearer!
Which is why God's people through faith and love to God keep His commandments until the very end of time! Rev 14:12 Rev 22:14 Rev 12:17 but sadly it is just a remnant although God's free gift is available to everyone.