Musar sobre Deuteronômio 13:6

The sixth section: One who has the ability to protest, but does not protest and has no words of reprimand in his mouth; and does not use the swords of his eyes and does not take responsibility for the deeds of sinners. So he will not be a man of reprimand, whereas we were commanded to destroy the evil from within our nation - as it is stated (Deuteronomy 13:6), “and you shall destroy the evil within you.” And our Rabbis said (Shabbat 54b), “Anyone who is in a position to protest against the members of his household and does not protest, is apprehended for the members of his household; if he is in a position to protest against the people of his city, and does not protest, he is apprehended for the people of his city; if he is in a position to protest the whole world, and does not protest, he is apprehended for the whole world.” And it is stated (Leviticus 26:37), “A man shall stumble over his brother.” And they, may their memory be blessed, expounded (Sanhedrin 27b), “‘A man over’ the iniquity of ‘his brother.’” And they said that all of Israel is responsible for one another.

The sixth category of flattery is he who is in a position to protest against an evil and does not protest, nor does he pay any attention to the deeds of the sinners. This thing comes close to flattery, for then the sinners think, "As long as they do not protest and do not reproach us, all of our deeds must be good." But we have been commanded to root out the evil from our midst, as it is said, "So shalt thou put away the evil from the midst of thee" (Deut. 13:6).