Q: What is the function of evil in our world?
A: Evil does not really exist in our world. It all depends on the intensity of the Light: when Light shines a little stronger, we feel it as good, as rest. That is the Light of which people speak who have experienced clinical death. A smaller amount of Light is sensed by us as states of depression, disaster and disease.
It all depends on the power of illumination that shines over each person individually. “Bad” is actually the lack of Light.