That's because people don't generally believe the truth... It takes them a while to pick up on the difference between irrational beliefs and facts. Basically, unless you tell people what they want to hear they wont hear the truth either way. Lying just happens to be a more creative way to motivate change. Personally, I believe, creating through addition benefits everyone whereas creating through subtraction harms everyone. Even if it benefits that "one" individual temporarily the psychological damage is usually irreparable.