There needed to be some kind of sacrifice. For the “greater good” of humanity, a group needed to sacrifice 100 souls. This is the way that TPTB are able to sustain themselves generation to generation. As they sacrifice souls, the souls do not become immortal. Nobody is allowed to move on. It has to be totally voluntary, though. These people had to willingly sacrifice themselves so that their souls would go to these people. There were a lot of people that wanted to give themselves for the sacrifice, though, for the “betterment” of mankind.
This was disturbing to me on many levels…the worst thing being how many people were willing to sacrifice themselves for this goal.