It is not the pursuit of good government, however, that has put this country on a collision course with the leadership in Palestine and Iraq. Our motives are more fundamental than that: The U.S. government has made a decision that it will not permit either mass terror by Baghdad or random terror by the many Palestinian militias to set the norms of how others, in the region and beyond, live or die. This is the critical principle underlying our Iraqi policy and our Palestinian policy. It is, at root, a statement about how we define civilization and how we defend it from its unconventionally armed discontents.