Human beings, thanks to culture and genetics, are inclined to be pessimistic, fearful, skeptical and believers in conspiracy theories. We also don't like change.
The marketer (products, government, religion, whatever) that decides to trade in any of these glitches has a tremendous advantage. It's far easier to create fear than to soothe it, far easier to argue for a conspiracy than to prove that one doesn't exist.
When we find ourselves rewarding our instincts instead of reality, we often make poor choices. Of course, sometimes there's a good reason to be afraid or to imagine that a secret conspiracy is at work. Not often, though.
When confronted by a mass of facts and nothing but instinct or tribal confirmation on the other side, it might be worth revisiting why we choose to believe what we believe.