I don't believe in reincarnation. But if it exists, then this is some kind of automatic system, probably under the control of computers or AI. What people see is hallucinations or hologram simulations: for example, people see their dead relatives, but they behave strangely and are always so kind and unnaturally joyful, isn't it suspicious? Would real people behave like this in this situation? It's like some kind of AI or a program based on a person's memories builds these simulations, they don't see their real dead relatives or "angels" - this is a hoax, just computer-generated simulations.