From the Human Rights in Practice Series: Samuel Moyn, Yale Law School, asks what is wrong with "forever war" - as the post-9/11 campaigns of the United States have been called. For a broad swath of critics, the trouble is its inhumanity - especially the peril it brings to civilians. What, however, if the opposite is true - and the problem is that the war on terror is the most humane war ever fought in history?