As more details emerge about the life of Stephen Paddock, one thing is clear: on paper, he does not appear to fit a typical profile of a mass shooter. The 64-year-old former accountant who carried out the deadly massacre in Las Vegas on Sunday night was a successful real estate investor who stayed in touch with family and took care of his mother. He was a gambler, but not a reckless one. It appears Paddock liked to have a strategy. Over the past three decades, Paddock was involved in nearly a dozen real estate deals. At first, he invested in...