I was the guest on C-SPAN’s “In Depth” program on Sunday, April 5. Afterward, the volume of my e-mail messages rose substantially as people wrote to me to express their opinion of my performance or to ask me questions. Although many of these messages sent approbation, for which I am grateful, others, like most of the people who called in during the program, were less than complimentary. I had a foreboding that one of these messages might contain, shall we say, a bit of denunciation when I saw that its subject line read “You’re a fucking STUPID and VAPID.” In...