Matthew Alexander, former U.S. military interrogator and author of the opinion piece 'I’m Still Tortured by What I Saw in Iraq' published in the Washington Post, discusses how information gleaned from ethical interrogations enabled the killing of Abu Musab al-Zarqawi, the relatively moderate views of most Iraqi Al-Qaeda members who joined for practical rather than ideological reasons, the moral and operational failure of torture and the enduring legacy of Abu Ghraib and Guantanamo as a...