The Problem of Evil arises when you start asking right the questions. For example, Why does God allow evil to exist? Or, why would God create an evil god-like adversary? It’s a problem that opens up many issues.
The mass hallucination is like a tunnel. When you look into the tunnel, all you can see is darkness. It’s only when you are able to turn around and look out that you see the light. Find out which way you are facing.