First: I do not believe in ghosts.
But assume they do exist. What are the ethics? Should the hunter try to “help” the ghost find “peace”? Say the hunter can establish contact, a dialog. Does he say, “You’re dead! You don’t belong here. Go to the light!”? Is that the best thing for the restless spirit? Some religions teach that suicides are forever damned to hell. What if the shade is that of a young woman who, in a moment of depression over the loss of her One True Love, threw herself from a precipice? Does she deserve to be damned for that? Wouldn’t “going to the light” take her to a worse place than she already inhabits?
What about the playful spirits of children? What if they’re having fun being ghosts? What if they’re living (as it were) in an eternal amusement park? Is it right to send them to “peace”? What if “peace” is boring to them?
What of helpful spirits? Some have been alledged to save the lives of others. One would assume they like doing the service. Should their livelihoods… er, “deathlihoods”? be taken away? By sending them to their Eternal Rest, does the hunter condemn others to death, who might have been saved if the ghost had illuminated the lamp in the old lighthouse or appeared at just the right time to alert them to danger?
It seems to me that “evil spirits” probably deserve to be sent to hell. Would they believe that their torment will end by going to the light? Would they want to go to the light. Can ghosts even see the light? But assuming evil ghosts can and should be sent away, should friendly or helpful ghosts also be sent away? What mortal can know whether it is better for the departed to hang around, or to go away? Do ghosts have a right to exist?
So what’s “right”? Let them haunt unmolested, or help (or force) them to find the way to where they’re “suposed” to be?