Did you notice the Sheriff's little Mona Lisa smile right around 26+ minutes, where he was being asked the question that went something like, "It is being said that Paddock bought 33 weapons beginning in October 2016. Are you looking into whether something may have happened in October that caused him to snap?"
I'm thinking it's more like mid-October (Wikileaks) through November 4, 2016 that caused him to snap.