2 Thessalonians 3:6
Now we command you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us.
Paul here says we are to remove ourselves from others who continue to believe they can walk disorderly in unrepented, or unconfessed sins. For they are not walking in the Spirit, but still walking after the flesh.
Again you make assumptions about words. You assume
"disorderly" means disobeying the law (which you yourself do anyway).
Christians under grace, however, see "disorderly" as referring to non-believers falsely claiming to be Christians.
1Cor 5 gives the same warning, but using a different description.
Within the church of Corinth they had amongst them a false brother who was into sexual immorality with their father's wife.
Reading this in spiritual terms (1Cor 2:14) it speaks of one who is into spiritual sexual immorality with their father's (Satan. See John 8:44. This is the description Jesus gave for legalists) wife (Hagar, who is symbolic for righteousness by works of the law).
We see 1Cor 5:7 confirms this by warning to
purge out the old leaven.
What is leaven?
See Matt 16:12
Then understood they how that he bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees.
And note 1Cor 5:11-13, about such disorderly members within the church.
But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolator, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
12 For what have I to do to judge them also that are without? do not ye judge them that are within?
13 But them that are without God judgeth. Therefore put away from among yourselves that wicked person.