The problem of evil assumes the existence of a world-purpose. What, we are really asking, is the purpose of suffering? It seems purposeless. Our question of the why of evil assumes the view that the world has a purpose, and what we want to know is how suffering fits into and advances this purpose. The modern view is that suffering has no purpose because nothing that happens has any purpose: the world is run by causes, not by purposes.
... W. T. Stace, Religion and the Modern Mind