If we're talking about reality as a whole, the best thing to wish for would be a total removal of all consciousness, and somehow a total containment of all consciousness from ever appearing. But that's just a kind of maximally ideal fantasy wish sort of thing.
If we're talking about Earth only... something would have to go "wrong" where someone benevolent(or pro-socially psychopathic) were to somehow gain totalitarian control over the world, annihilate the power structure, and engineer a genuinely benevolent species that is somehow persistently immune to the reality of covert evil being the winning strategy in our world.
But it's a little bit like articulating the problem of predators in the wild and asking, "What would need to happen for the Zebras and all the other herbivores to be truly free from the Lions? Well... something... would have to happen, where the irredeemable things at the top of the power structure, the lions, were eradicated, and the Zebras somehow ensured that they themselves did not just turn into the "new Lions" with time, while also not finding themselves the victims of some future "Lions 2.0" that would appear with a matter of time" And it all just becomes a kind of fantasy scenario just like the first one where we're asking a genie for a wish.