The light needs the dark : think of life without sleep, without rest. Without the night we could not have the day.
We are all divine beings, even those whose actions seem so far less. We are here working together for one purpose : conscious evolution. If everything were perfect, what motivation would we have to grow, to push ourselves to expand and become better.
It may not seem like it at times but the darkness is our best friend, guiding us once more towards the light