If you think of all that is going on/what we have been awakened to understand, as a spiritual war, do you think this physical realm is the entire battlefield? Is it really that far fetched to believe transmigration of the soul? Those entangled with evil in life, will seek a continuation after death by returning to a place that does not shun them, to a place where they can continue through ever nefarious means of controlling the "stage." It is up to the forces of light and good to counter them, sometimes taking lifetimes themselves to "stage" their own plan of attack. Darkness To Light.
Not exactly biblical, but perhaps that chapter is currently being written.