Very good question.
I guess the best possible answer is that I also believe in Evil.
But there is a little bit more.
If you look at evolution, we are learning more daily about
How it worked. As we learn more we are able to understand the wonder of it all.
But it is not just the world, species and Universe that are evolving.
We, as individuals are also evolving. We learn more daily about how sickness works and what we can do to prevent or cure it.
Slowly, we are learning more about how the mind works. We are learning how to heal even thought but far slower (it's much more complex a problem) then our understanding of the physical universe.
Gradually we are learning more about weather and we have been able to reduce the pain and suffering there as well.
We are learning more about how societies work and striving to find some reasonable substitute for warfare as a way of settling disputes.
We are evolving, just as everything else is evolving.
And could that not be GOD's purpose? Is it not possible (and for some of us perhaps even a reasonable expectation), that one of the species that will follow humans, post-human, evolved human, might not one day grow into something that might even be a suitable companion, perhaps even friend, of GOD?
Aslan is not a Tame Lion