clipped from: www.prospect.org   

It's commonly argued that the Iraq War had something for everyone; humanitarians got a humanitarian cause, evangelical democrats got to promote democracy, realists got to eliminate chemical weapons, partisans of the "Ledeen Doctrine" got to beat a small country to a pulp, and "national greatness" advocates were able to demonstrate the power and reach of the United States.

Each of these political ends, however, places different limits and emphases on the use of force. Unsurprisingly, these limits do not always agree, and often vary in dramatic fashion. Beating the enemy to a pulp and destroying chemical weapons call for certain military means directly antithetical to humanitarianism or the development of democracy. In Iraq, the inability to describe a single compelling political justification for the war led to a confused, haphazard, and ultimately self-defeating use of military force. The marketing campaign necessary to launching the war ultimately doomed it to failure.