I doubt you want to open that can of worms, because it means Hitler was predestined by god to be so vicious and cruel that we came up with the word genocide to describe the amount of people he killed.
Well of course that's what it means; but I don't see it as "a can of worms"--I see it as the nature of reality.
Italy was not the best it could be before Mussolini took over, and then not suddenly the best when Mussolini took over, and the best yet after the decline of Mussolini's Fascism.
Pre-polio wasn't the best we could have, because if it was the best we wouldn't have had polio. There is this idea that goes we have to work with what we have. That doesn't imply nor should it suggest we have the best possible scenario/situation. It's what we have. And as far as medical treatments are concerned, we are still years and years and decades away from having "the best," if we can even ever perfect our methods and treatments for healing people.
The argument is not that every aspect of reality is as good as it can possibly be; some things in isolation are clearly NOT as good as they can possibly be. The argument is that the universe as a whole is the best of all possible universes. That's a universe that includes Italy, both before and after Mussolini, and human beings, both before and after polio. The best of all possible universes includes the state of medicine as it was 500 years ago, as it is today, and as it will be 1000 years in the future. The best of all possible universes contains the best possible state of affairs at any given moment, even though the best possible state of affairs necessarily changes over time.
God has nothing to do with it. Morality is something that even atheists concern themselves about. It's a far cry to believe it's somehow exclusive to theists and god.
We weren't talking about morality, we were talking about the problem of evil--and God has EVERYTHING to do with it. The problem of evil is why a God Who is all-powerful and all-good would allow evil to exist in the world. If God does not exist, then the problem disappears.
That isn't using Occam's Razor, but making an appeal to popularity, something that serves only to prove how popular something is.
I'm not trying to prove how popular God is; I'm observing that He is popular (to wit, that 84% of all people on Earth believe in God), and then looking for the simplest explanation (per Occam) to account for the observed fact. In this case, the simplest explanation is that God exists, but it is not necessarily the correct explanation, as Occam's Razor is a guideline and not an ironclad guarantee of accuracy.
I'm glad software and hardware designers do not have that attitude, because if they did we wouldn't not have patches and updates to improve such things once they are released. Something may be "the best" we have now, but there is always room for improvement.
But that improvement still happens in the same universe, so the universe is not made any better simply because new aspects of it have been revealed to us--it's still the same universe it has always been, the passage of time just facilitates revealing the process of becoming what it was always created to be.