Of Snakes and Stags (смешанная)

When the Boy-Who-Lived stood in the middle of the clearing, waiting for death with terrified yet resigned eyes, the Dark Lord Voldemort thought that he had finally won. That he could now shape the world the way he was always meant to do, with no Dumbledore, no prophecy, no boy with green eyes stubbornly standing in his way. He raised his wand and confidently cast the Killing Curse and, once again, his life fell apart.
OR
When Harry chooses to come back to life, he takes with him the entirety of Voldemort's soul. In doing so, Voldemort's mind and body reset to the time right before he made his first horcrux; he is seventeen again, and does not seem to remember the horrors he has committed. The Light wins the war, and is left with an impossible decision. What should be done with Tom Marvolo Riddle?