Technically I concede that you are correct; however I believe that the teaching that we are not under law but under grace is more important in some cases.
When Jesus spoke those words, He was addressing unsaved Pharisees who were perverting the Law and adding impossible demands. Besides which the Law was given to show people that they are unable to please God in their own efforts.
Rom 6:14-15
14 For sin shall not have dominion over you: for ye are not under the law, but under grace.
15 What then? shall we sin, because we are not under the law, but under grace? God forbid.
KJV
1 Cor 6:12
12 All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any.
KJV
1 Cor 10:23
23 All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not.
KJV
Some husbands are abusive in spite of the fact that they are told to love their wives in a self sacrificing way.
Some wives are abusive to both husband and children.
Sometimes when a person feels the need to choose between two kinds of disobedience; it is not our job to judge them.