But this thread has been about natural evil where the free will defense is not applicable.
Quite correct, though I don't agree with the term "natural evil", nature is not evil.
Regardless, it has been tried a few times and shown conclusively to be inadmissible.
Unacceptable you mean?
But you can. We have treated it in some detail and shown why it fails as an answer to natural evil for a god of love.
Ah, the issue is how do we define Love for a being that transcends our emotional AND temporal understanding of love?
It is very hard for us to reconcile a God of love with one that allows for horrific events and countless deaths because of the emotion attached to those events and rightly so. The moment we reject a view because it doesn't reconcile the with our notion of a God of LOVE then it seems we are making an emotional issue out of it ( not that there is anything wrong with that mind you) and that doesn't make the argument invalid or incorrect as much as "emotionally unaccetable".