Americans like to think of themselves as compassionate and generous, and they often are. But when it comes to the casualties in other countries caused by U.S. wars, says John Tirman, Americans tend to be ignorant at best and callous at worst. By one estimate, American wars since 1945 have taken the lives of 6 million people, both civilians and soldiers. An early 2007 poll asked Americans how many Iraqis had died in the Iraq War. Their average answer was nearly 10,000 when in fact the actual number was in the hundreds of thousands. Historian Richard Slotkin says this neglect of casualties on the other side stems from what he calls the "the frontier myth." This is the notion that righteous violence is justified to subdue or annihilate savage peoples. Today we call them terrorists (Washington Post, January 8).