That's basically the free will theodicy, and it hinges entirely on a broken concept of free will and moral responsibility. On a sane understanding of what free will means (and what moral responsibility means), it is entirely possible to have beings that can reliably be counted upon to freely choose never to do evil, and be morally praiseworthy for that free-but-still-wholly-predictable choice.
And none of that even touches on the problem of "natural evils", i.e. the hardships of just existing in the world, regardless of the actions or inactions of our fellow humans.
Of course if there isn't any such thing as objectively good / bad / evil / right / wrong / etc, all of this becomes nonsense on stilts, but then godhood is also reduced to nothing but relative knowledge and power, and by that standard we are gods to ants, and whether or not gods relative to us exist is reduced to the question of whether there are sufficiently advanced aliens or not.
Your use of 'sane' here pretty much slides you into the realm of an atheistic religion, particularly since you're basically taking the position of hard determinism--and that's not even starting to touch on the fundamental assumptions involved here. Quite a few atheist, agnostic, and nontheist positions would argue that 'natural evils' is an absurdity --or, at the very least, requires there be god(s), because only moral agents can be said to have a morality. Otherwise, however unpleasant it might be, it isn't evil/wrong, it just is.
Oh, yes, and there's moral ninhilism--which argues that there really is no such thing as objective morality, no less if good/bad/evil/right/wrong/ect. It's also worth mentioning moral relativism, which in its normative flavor basically goes screw it, this is a mess, so let's just try to get along.
Now, to address the your repeated claim that "free will is theodicy": Atheist existentialism takes the view of free will without god(s), and potentially as a consequence of that--and existentialism of any flavor says that responsible for our actions because we possess free will.
Meanwhile, hard determinism would make Calvinism a close philosophical relative, just to give some idea of just how little relationship there is between free will and the existence of god(s) there is within philosophy. (In fact, to some positions, the problem of evil itself is theodicy: somebody's got to have the authority to define what is good & right.)
At this point, it seems necessary to point out that it's quite possible to dislike sophistry with utter indifference to sophist's position on the existence or not of god(s).