In CS Lewis' The Great Divorce, the last chapter ends on Earth in WWII England. What is significant about ending the book in a war scene?

The setting shifts again to a surreal, unnatural setting where the only tangible item is a silver table. The gigantic motionless figures are very different from the Bright People described in heaven. This final setting strikes fear into the narrator, who feels that he has been either misled or has misunderstood everything. But he does understand immediately that the conversations between the Bright People and the ghosts were reflections of what took place on earth. The massive death toll of WW2 brings fresh significance to the afterlife.