"Listen, you do-nothing superiors of clerics and priests. Listen, and even though you feel sure of yourselves, tremble at the thought that you are partners in the guilt of others; those, I mean, who wink at the sins of their subjects that need correction and who by ill-considered silence allow them license to sin. Listen, I say, and be shrewd enough to understand that all of you alike are deserving of death, that is, not only those who do such things, but also they who approve those who practice them." 
Saint Peter Damian, Doctor of the Church, written a thousand years ago.  Still relevant.