When I replied to your geneticist scenario I did state that he was "guilty of building 7 harmful robots". The problem again is that your scenario and the nature of God are not equal - what analogy of God truly can be? I'm not denying the existence of evil. If anything [and I only bring up your "Rule of Conscience" to make this point] aren't you denying the geneticists' evil actions via the ROC? e.g. he acted according to his conscience and to him creating killer robots wasn't evil and thus it wasn't.
In my opinion there is a far more direct and primal question if we want to wade into theodicy: why didn't God just fast-forward to the endgame of New Earth, bypassing all of the evil and imbuing his creations with all of the same wisdom and understanding of his Glory that we would otherwise have gained in the unfolding of Creation?
Neither a Calvinist nor an Arminian (and not even an Armenian Arminian, not even an African-American-Armenian Arminian) gets to dodge this question, no matter how much they struggle against their prideful wish to get God off the hook or to preserve the idolatry of their own free will insistence.
Only an Open Theist such as yourself is prepared to go the extra-mile, defenestrating God's power and omniscience to the point that God can't even know the actions of men ahead of time, so evil surprises God just as much as it does its victims. If you hold that that's Biblical, then more power to you. Literally
I don't know the answer to the question myself, and I can only go on the glimpses occasionally revealed in scripture. On this side of Judgement, maybe it's just going to have to be one of the secret things that we're not meant to understand.
But I can look to some verses that may shed a clue and support the argument that our God's a storytelling God, and Creation is one big Theatre of God's Glory. Take Isaiah 27:2-5 for example:
"When that time comes,
sing about a delightful vineyard!
I, the Lord, protect it;
I water it regularly.
I guard it night and day,
so no one can harm it.
I am not angry.
I wish I could confront some thorns and briers!
Then I would march against them for battle;
I would set them all on fire,
unless they became my subjects
and made peace with me;
let them make peace with me.”
Anyone holding to God's omnipotence must ask where the thorns and briers are coming from. Is there some power outside of him creating them? Is he "wishing" for them because it's out of his control, or wishing in the way I might say "I wish to have some toast today for breakfast"? When he says "unless they became my subjects" does this mean he can't make them? But then does "let them make peace with me" echo the same uncertainty?
How about Genesis 50:19-20:
"But Joseph said to them, “Do not fear, for am I in the place of God? As for you, you meant evil against me, but God meant it for good, to bring it about that many people should be kept alive, as they are today."
Like Isaiah 10 we seem to have a God that's operating on a level that is able to author evil without committing it, able to steer the flow of the story without turning us into robots.
If you are affronted by this and you sleep better believing that God cannot author what we at our level call evil, then God gave you the freedom to construct whatever model works best for you. I think at least on that we agree.