I'm mean, he can do anything right? He's omnipotent. So...why not? He could do it in the blink of an eye and wipe out hell and the evil in the world.
If evil was taken out of the world, we would go extinct.
All human to human evil is a component of our evolution and if we did not do the small bit of evil we do as compared to the much greater good in evolution, we would go extinct.
As we evolve we must both cooperate and compete. When we cooperate, all is good as no victim is created. When we compete, we create a loser to those competitions and the losers would feel that evil has come his way.
As to from the Christian perspective; the ancients seemed to know the answer to your question better than todays poor apologists who cannot explain why, at Easter, they sing of Adam's sin being a happy fault and necessary to Yahweh's plan.
The paradox for modern Christians is that they call what was necessary to Yahweh's plan, our fall.
The complete opposite to what they sing and also opposite to the Original Virtue that the Jews read into Eden as compared to the Original Sin that Christians interpreted for the same story/myth.
Satan is Yasweh's loyal opposition, and without A & E eating of the tree of all knowledge, there would not have been any sexual or moral awakening in man and none of us would be here as there would not have been any knowledge of reproduction.
As you can see, I have no problem of evil that so many argue about. Either you thinking nature or god, this explains the problem of evil. It is a small eveil within the greater good of man living and thriving.
Regards
DL