My guess (so not a spoiler) - all of the people have done evil things and the Devil is coming to get them.
Can't he just claim them after they die? That's the usual method. Does he have to intervene because otherwise they'll somehow escape him?
Seriously, what would be the point?
They could become good, if given the chance to live. Or, if you're into that sort of thing, "form a personal relationship with Christ" and all that nonsense. Although you'd think being confronted with the Devil would be the quickest way possible to convince someone to sincerely pray to Jesus.
I hope some folks watch this. I'm really interested in seeing the reactions to this film, but not nearly as interested in actually forming any opinion of my own, for obvious reasons.
Well, at least until the inevitable Rifftrax is out.