Voldemort knows that Harry understands game theory, and has no incentive to drop his wand if he ends up dead and cannot save everyone anyway

So now you're saying that Voldemort can order Harry to keep his wand lowered and threaten him with death if he raises it, but he can't order Harry to drop the wand and threaten him with death if he refuses?

I somehow doubt that you would have come to this rather very specific conclusion if you hadn't needed to explain-after-the-fact the things we saw occur in the story.