DEUT615 The sixth category [of flattery] consists of one who is in a position to protest, but does not do so, and he does not take to heart the deeds of sinners. This is akin to flattery, for the sinners think: Since they do not protest and they do not rebuke us, all of our deeds must be good. And we have been commanded to remove evil from our midst, as it is written [this verse]: "And remove the evil from your midst." And our Sages of blessed memory have said (Shabbos 54b): "All those who are in a position to reprove the members of their household and do not do so are held accountable for the sins of the members of their household; those who are in a position to reprove the people of their city and do not do so, are held accountable for the sins of the people of the city; and those who are in a position to reprove all men and do not do so, are held accountable for the sins of all men." For it is written (Vayikra 26:37): "And they shall stumble one upon the other," which our Rabbis of blessed memory interpreted as "one, for the transgression of the other" -- wherein we are taught that all Israel is responsible one for the other (Shavuos 39a).