Well, presumably one who's joining a doomsday cult is most worried about the doomsday (and would be relieved if it was just a bullshit doomsday cult). So wouldn't that be a case of jokes minimizing the situation as it exists in the speaker's mind? The reason that NORAD joke of yours is funny to either of us, is that we both believe it can actually cause an extreme catastrophe, which is uncomfortable for us. Why wouldn't a similar joke referencing a false doomsday not be funny to one who believes in said false belief as strongly as we believe in nuclear weapons?

Why the ellipsis?

To indicate that a part was omitted.