Because if a person is going to advocate immorality for others, he's pretty damn hypocritical if he holds himself above it himself, eh?
Like a evil man who portrays a deadly-risk task as a cakewalk and motivates a co-worker he secretly dislikes to do a the job , saying "Hey, trust me, it's safe, it's easy" The co-worker is killed. The evil man washes his hands and moves on.