Many on the political left have become disillusioned with Barack Obama because of his escalation of the Afghanistan war, his bailout of the financial industry, and his failure to advance his domestic agenda. As a result, they read his speech in Oslo, Norway, through the lens of disillusionment. Pacifists (who must not have been listening during the presidential campaign) are appalled by his defense of the just-war theory. Others argue that he has not proved that the Afghan war truly is a just war.
Such criticisms failed to see the speech for what it was: not a detailed defense of the Afghan war, but a comprehensive overview of the role of the United States in international affairs, a view that is principled and realistic, not ideological or naive.