The last time I went to Las Vegas, the LED billboards on the strip had stopped advertising Cirque du Soleil and showgirls, and instead were displaying the phone numbers for trauma and suicide helplines. It was Thursday, October 5, 2017, four days after a man with an arsenal had opened fire from his hotel room window in the Mandalay Bay resort and casino onto the Route 91 Harvest Festival down below, while Jason Aldean was performing. From my room in the adjacent Delano, I could still see the cri