GHAZNI, Afghanistan, Oct. 5 - "Don't be harsh to the people!" President Hamid Karzai beseeched his security detail, which was bearing down on an overly eager crowd with sticks and automatic weapons. "They will calm themselves!" Below the stage, white pigeons meant to symbolize peace were tentatively stepping out of their coop. Soon Afghanistan's president tried to do the same. "If you sit in your place, I will come say hello to each one of you," Mr. Karzai told the surging crowd, and then he marched off the stage toward the throng. He did not get far before his guards...