15 He who justifies the wicked, and he who condemns the just, Both of them alike are an abomination to the Lord. (Proverbs 17:15)
It is one thing to justify the wicked and quite another to condemn the just. In the assembly, before the Lord, we must walk in His Holiness and Righteousness. And when that Holiness and Righteousness becomes an offense to any of the brethren, beware! For certianly strife is at the door. Let me quote another verse of wisdom from Proverbs.
5 It is not good to show partiality to the wicked,
Or to overthrow the righteous in judgment.
Keeping in line with the walk of holiness and righteousness in the assembly, when the wicked gain entry by stealth, but then are discovered by some, that wickedness needs to be dealt with swiftly. If it is not dealt with swiftly the end result is destruction for the assembly and the relationships involved. This can lead to the overthrow of the righteous in judgment.
The only way to avoid such calamity is to build relationships such that you can trust one another in Christ Jesus. For such a test reveals the lack of love and trust among the brethren in the assembly. Even the lack of knowledge in the Lord.
This is why Paul spent so much time exhorting various assemblies to have true love and grace for one another. Not to be condemning one another, but building each other in Christ to the edification of all. Yet it still each one’s responsibility to act on what we know of the Lord. He alone will chastise or commend each one of us according to our acts in righteousness or unrighteousness. Even for some to the outer darkness with weeping and gnashing of teeth.