He will isolate them and make them believe they are an island in a sea of depravity, that signs of an eminent apocalypse are all around them. If he is adept at his task, members of the flock will readily lay down their lives in defense against this phantom threat. Ask them why, and they will state that their fatalistic beliefs are merely the result of unbiased, objective observation of the world around them. They are telling the truth! They just do not grasp the fact that they do not believe based on what they observe; they observe based on what they have been tricked into believing.