This was made by the same person who made "lost". So I didn't set myself up like some people did. I already knew more than likely we was gonna get one of them "fill in the blanks yourself" endings. Episode was great for what it was trying to convey.
Anyway, just watched a short from H.B.O about the episode. They basically confirmed what some of us guessed the show was all about. They said that it was about how humans react to the unknown. How they approach it, try to figure it out, or just let it be. In this case it was a doomsday scenario. Pretty much showed how everybody would react to it. Then ultimately what people do to move forward. Like I posted before, they explored pretty much every way people would approach a situation like this. Science, religion, cults, conspiracy theorist, spiritualist, psychics, psychiatrist, etc etc. Here the creator answers some questions.
http://www.esquire.com/entertainment/tv/news/a55441/the-leftovers-series-finale-explained/
Also they were telling us we were never gonna find out what happened in the intro song lol. "
let the mystery be". Ignore the ending and this show is G.O.A.T.