I can't figure this one by myself.
I've done some digging and it looks to me like the Emperor made a huge mistake in his aeons long plan. Humans invariably fail.
He was trying to guide the human race to its ultimate destiny of becoming this psychic "super race" and taking control of the universe (one presumes) making each and every human as potent a being as He was.
But the Emperor was human Himself, the best of humanity, but still... So He must've looked in the mirror (so to speak) and known He was going to fail in this great endeavour?
Was it an oversight? Pure arrogance in that He believed He couldn't fail? Or did He simply not know?
I understand the Chaos Gods played a role in this, clouding His vision or something. But surely a super psyker master race would be a good thing for them and a bad thing for humans? Coz wouldn't they just go the way of the Eldar and get eaten en masse by the denizens of the warp?
I'd appreciate your views on this one