Hanson relies almost exclusively on history, no doubt because of his background as a historian. He also writes about the Vietnam War but advises, " make no mistake, Iraq is not like Vietnam, and it must not end like Vietnam" (Hanson B01). He recalls that we have an all-volunteer army, unlike the conscription army of Vietnam. He warns that leaving Iraq now would moralize America's enemies in the area, which happened after the Vietnam War. Krugman doesn't mention WWII, but Hanson does so extensively. He compares the increase of Islamic terrorists in Iraq to the increase of Nazis in Germany during the war. He says America can reverse this trend through force as it did in Germany. He discusses the success of reconstruction in Italy, Germany, and Japan, which may be achieved in Iraq through perseverance.
Both men mention public opinion to support their case, but Krugman more so. Krugman writes, "a solid majority of Americans now believe that we were misled into war" (Krugman A23) and that we can now have serious discussions about Iraq since "the public has realized the truth about the past" (Krugman A23). Hanson, however, discredits public opinion. He writes that "the New York Times recently deplored the public's ignorance of American heroes in Iraq" (Hanson B01).