You need answers to this why? There is no monolithic ‘pyschic’ group which will shout how inaccurate or inauthentic your story is. You’re writing fiction, get fictional. For example
[Fiction] Diogenes has conclusive proof of psychic abilities. But, for our own safety, he labors to convinces us that they are not real. It was years ago, in college. He’d been reading the philosophy of the original Diogenes. It was late. He was tired. But the words drew him on and on. He could feel them sliding around in his half-conscious thoughts like puzzle pieces dancing in a lava lamp. Then, he thought he saw the picture. The pieces clicked. Diogenes had become psychic. That’s how he knows about the invasion. The Sk’loryx have come. Great legions of their warriors have invaded the astral realm. They mean to kill our minds, inhabit our bodies, and take this world for their own. But, they can only attack a mind connected to the astral realm, as the mind of a psychic is. If just a few million of the teeming populace were to find their psychic gifts, it would be the end of the human race. Only an experienced psychic can fight the Sk’lorix. With enough bodies the Sk’loryx could mount a physical attack. To save us, Diogenes must make us believe his lies. For own sake, he must keep us ignorant. Billions of lives depend on it.[/Fiction]
Make it all up! It’s just that easy!