It is his responsibility, and he takes it seriously, that he will be called to account as the head of his flock. He can not turn a blind eye toward those transgressions.
Recall this Sundays reading where God tells his shepherd that they will be held accountable for their flock if he does not lead them righteously.
Exactly. Christians need to stick to sound doctorine. The Bible is our guidance to what is right and what is wrong. To deviate from it is a major major problem.