Most people consider Las Vegas the most outlandish city in America. On its 100th anniversary, I argue the opposite. It’s the “All-American City.” In one of those kids-say-the-darnedest-things segments, a young boy said about skin, “It keeps us from having to look at our insides.” That insight applies here. Las Vegas is, ironically, a view of human nature with the skin removed. It shows our insides: power, money, ideas and sex. These are largely interchangeable. What brought up Las Vegas is an upcoming trip for my wife and me, which we’ll take shortly. It’s something of a “do-over” for a...