When I was in the early years in TV we had what we called "The dead kid file", it was a horror, because there were seven missing kids with nothing in common and from seven different areas. The dead kid file was no-where land for any reporter as all you could say, day after day, is that police see no connection.
It broke because of some very clever detective work which was closely followed by a protege', a kid who had "worn" the missing kid albatross no one wanted.
It became one of the greatest injustices ever under Commonwealth law, as prosecutors had to agree to pay $10,000 per body to the killer's wife in order to get a conviction.
https://en.wikipedia.org/wiki/Clifford_Olson
With something that horrific, you absolutely have to believe in evil. Not just sinning and ****, but pure, demonic evil. Oddly, at the time I truly believed and stated that it was demonic. What is odd is I had no faith in a god then, but could grasp evil. It was years later when I found out that the only serious warning He ever gave was about children: "He who touches the hair of the head of one of these little ones" I think it goes.
So in the "I hope he gets what's coming to him" arena, I have to leave to the God of my understanding who has declared "Vengeance is mine!"