abrogate -
To abolish a custom or law by some authoritative, formal, legislative, or other legally effective method.
abolish - formally put an end to (a system, practice, or institution)
The old covenant, made obsolete, and abolished in His flesh. This had to be done in order to establish the new covenant and to end the old covenant Mosaic system. (Heb.8:13, 2 Corinth. 3:13, Eph.2:15, 2 Tim. 1:10)
the law is righteous = the law is just
Doing the law could not make anyone righteous/justified. (Acts 13:39, Gal. 3:11, Gal. 5:4)
One can only be made righteous/justified by faith. (Rom. 3:28, Rom. 5:1, Gal, 3:24)
David broke the show bread law, but he was found to be righteous/justified. Jesus was justified in breaking the sabbath rest when he fed the disciples and healed people on the sabbath.
justified -
"An answer or defense to an allegation of wrongful conduct that the act or omission, though admittedly committed, was not wrongful in all the circumstances."
The thing is, most of the time when we disobey God's law, we are not justified in doing so. Therefore, we need a justified person to take our place and pay the debt that is due for our law breaking. Jesus, in His death, redeemed us from the law that was against us. If He didn't redeem us from the whole law, then no one could be redeemed from their debt for even slander, let alone adultery or murder.
Once He did this there was no longer a use for the law, in the legal sense. The law can no longer exact a penalty against us.
So the only way we can uphold the rightness/justness of the law, is by faith in Christ as our Redeemer from the law's just punishment. (Rom. 3:31)
Through faith in Christ comes works of faith, they are God's workmanship in His people.
That is how I see it.