Robert A. Pape, professor of political science at the University of Chicago and author of Dying to Win: The Strategic Logic of Suicide Terrorism, discusses his database of every suicide terrorist attack on earth since 1980, what it shows about the role of religion and occupation in motivating suicide terrorism, the Tamil Tigers in Sri Lanka, the amount of truth discernible from social science, the suicide bombing campaign in Iraq and spread around the world since the Iraq invasion, the...