If God exists, and God is perfect, then everything He has created must be perfect.
Why must this be so? If a perfect God exists and creates something, and that something wears out or becomes in some way imperfect, how does this in any way translate to God being imperfect?
I believe the reasoning is that a perfect being would not create something that is less than perfect, and if something wears out, then it it is 'perfect' to begin with.