That's actually a misconception.. Nothing is perfect. The existence of (a) God is a highly sensitive subject, I am, and going stay unbiased on that part.
I am a strong believer in evolution, but I don't rule out that a God could have set it into motion. I am merely a guy with assumptions, neither I, or anyone else on this planet has the answers. Much of what we ''know'' are merely assumptions and theories we choose to see as fact anyway. So please, don't take offense in the following.
The way I see it, everything in this universe is in constant conflict with itself, and everything around it. Making it change due to that conflict. Everything- including lifeforms like us humans, adjust to their environment over time. That's why I think there are so much different races of people, because Earth's climate is different everywhere. According from where we are, what we do, and how we do it, we experience things differently. Making me come to the conclusion that ''perfection'' as a factual phenomena is non-existing. It's make-believe. A product of our own personal views and desires. Of course, there's such a thing as personal perfection (or what we accept as it, anyway), but there is no such thing as ultimate general perfection.
As far as this planet goes; like I said before, things constantly change. It could very well be that what we witness here today, this well lubricated ecosystem we call Earth (nature), is the product of billions of years of conflict between (what eventually became) the building blocks of Earth. Changed just as long till it found a balance. We Humans seem to be a little bit arrogant towards everything that surrounds us. We tend to project our own views on things and species that differ entirely from us. If there is such a thing as (a) God, it could be that he/she/it doesn't even know the thing we know as emotions. He/she/it might have an entirely different way of functioning, perhaps even have emotions that are completely alien to us. Assuming just because humans need to design things in order to make it function properly, doesn't necessarily mean everything else must have one too. That would be nothing more then (slightly arrogant) speculation.
It could even be that we spawned from something else he/she/it created. That we came to be entirely by accident. Considering the scale and the complexity of the universe, one would think that something as small as the little blue planet we live on wouldn't even be a blimp on the radar of a high being like (a) God. For all we know- God or no God, we could be a product of another product. But back to topic, ''Good'' and ''Bad'' only applies for us as humans in terms of how it effects our emotions. And seeing as our emotions are (most likely) exclusive to our race, ''Good'' and ''Bad'' doesn't apply for the rest of the universe, because essentially there's no such thing. Like perfection, it is a non-existing product that only exists in our own minds.
But these are merely my thoughts, they might be right, they might be completely wrong. Just assumptions from the inferior mind of a still- and forever more developing primate. ;3
To sum this all up, and answer your question: Non, I have no prove because I don't believe good, nor bad exists. :3