It has sort of a drug effect on people to be told they need not worry. They keep coming back for more. It keeps their minds on a superficial level and encourages emotional dependency. It is an escape from reality. People under stress do one of two things; seek shelter or respond to harsh reality by a deeper recognition of what they are up against. The people who flock to the 'peace of mind' preachers are seeking shelter. They don't want to face reality.