If he was really scared of going "back" to Hell, then would he really do something so heinous as killing innocent people for personal gain? Thereby sealing his fate for sure! And how would the victims experiences change after only a couple of minutes? Would they not have to DO good/evil to have different experiences if this was examples of going to Heaven or Hell?
I could understand, to a certain degree killing the victim, who many years earlier had the experience, but then why would his change, since he had been only good ever since?
Made NO sense at all, and I accept, that he was crazy, but still the motive should be clear to at least him, and it wasn't!