CRR writes:
It is almost inevitable that the white eye mutation has occurred in the wild and it has not persisted so we can conclude that it is a deleterious mutation.
It's premature to conclude that white-eyed fruit flies don't exit in the wild BECAUSE of the mutation. Have you considered any other possible explanations?
CRR writes:
I suppose we could release white eye fruit flies into the wild and see what happens...
Why don't creationists ever DO that? Where are the experiments?
CRR writes:
If we can't predict what evolution 'would do", then evolution has no predictive capacity;
That isn't what predictive capacity is about. Evolution predicts, for example that dark moths on dark trees have a better chance of surviving to pass on the dark trait - and that is what we observe.
What you can NOT do is predict that there shoulda/woulda/coulda been white-eyed fruit flies and if there aren't then evolution is wrong.