One of the more satisfying conclusions I've reached as a participant in American life for nearly six decades is that we've grown into being a fairly kind, forgiving, and empathetic citizenry. Everywhere I travel, I find people striving to be helpful. I see complete strangers acknowledge each other walking down the street or standing in an elevator. Eating dinner out alone, as I often do when I travel, seems to bring about magically ephemeral friendships purchased with the currency of nothing more than the exchange of a first name. It's been a long time -- years, really -- since I've...