That fiction is easier to digest. It is likely easier for this particular apocalyptic cult to believe they are fighting against evil forces in the name of a coming paradise than it is to accept the truth — that they will be overridden in our cultural and personal memories by the slow but sure climb of society towards equality and progressivism.
Yeah the latter is just a boring, albeit, inevitable, evolutionary step. Probably most of the species is going to die out, next couple of hundred years. Will progressivism and equality reign? I don’t know if you can take it that far. But certainly things have changed and continue to change drastically. The traditional ideas that they are clinging to are long, long, long gone.