Yet domestic atrocities lately seem only to deepen our divisions.
The bombing of the Murrah federal building in Oklahoma City was seized upon to savage government critics like Rush Limbaugh.
After the murder of six innocents, including a 9-year-old girl, and the wounding of Rep. Gabrielle Giffords and a dozen others in Tucson, Ariz., by a certifiable lunatic, Sarah Palin was charged with moral complicity.
The slaughter of 20 first-graders at Sandy Hook Elementary in Newtown, Conn., put the National Rifle Association in the media cross hairs. With the massacres...