After the mass shooting in Tucson of Rep. Gabrielle Giffords, a federal judge, and other bystanders, President Obama gave one of those unite-the-divide speeches that give journalists leg thrills. We need to “sharpen our instincts for empathy,” he said. He lamented political finger-pointing: “It's important for us to pause for a moment and make sure that we are talking with each other in a way that heals, not a way that wounds.” The initial speculation was that conservatives were responsible for the Tucson horror. Even after this proved to be false, the attacks were relentless, with a barrage of media reports on the alleged excesses and mean-spiritedness of the Tea Party and all things right of center.