tl;dr it's a warning that every 12,000 years or so something terrible happens and we should prepare for it to happen again  a normal person would say "oh ok that's good to know, we should totally prepare for it" a psychopathic wealthy elite would say "we can't let other people know about this and we should use it to make sure we're the only ones who can prepare for it, so we can emerge as the new priesthood" basically
United States