 It marches on and drags us with it. And our sense of security is draped in the thinnest of veils. It only takes one bullet to pierce through it. Two days ago, that's very nearly what happened. The official narrative is that two days ago in broad daylight, a 20-year-old acting completely on his own, armed with an AR-15, managed to climb onto a rooftop carrying a rifle just 400 feet away from where Donald Trump was speaking at a rally in Butler, Pennsylvania. This was one of only a handful of rooftops in the area.