64-year-old Stephen C. Paddock flew low under the radar. He avoided interaction with many of the people around him, and his manner was direct and brusque. He was known to stay up all night gambling, but it was as if he was the only reveler at his own party.
They still don’t know why. – CNN.com

Stephen Paddock never left a suicide note, nor a declaration of intent. His family doesn’t know why he did it. The police aren’t sure. The media have no idea. Does that mean we can’t apply our minds and put the psychological puzzle together?
Of course we can! …. (more at link)