Because that would mean that they would have to acknowledge that they have failed.
"For Iraqi refugees without financial means, little help is available. Unlike other global refugee crises, in which governments work with aid agencies to help victims, this refugee crisis dares not speak its name.
For political reasons, neither Iraq's neighbors nor the United States wants to recognize these Iraqis as refugees -- or grant them permanent residency status. Small countries such as Jordan and Syria can't afford to be permanently burdened with hundreds of thousands of newcomers who have few resources.
Washington has other, more political concerns. ''For the United States . . . to recognize the existence of a million refugees would mean admitting they have failed to establish peace and security in Iraq,'' states Sarah Leah Whitson, who directs Human Rights Watch's Middle East and North Africa division.
As the White House struggles to produce a new strategy for ''victory'' in Iraq, this Iraqi exodus is an inconvenient reminder of Iraq's unremitting violence. As a result, the international response to the Iraqi refugee crisis has been dismal, according to Kenneth Bacon, who heads Refugees International. Despite refugee numbers that could approach those displaced in Darfur, aid agencies have few funds to deal with this crisis."
http://www.miami.com/mld/miamiherald/news/opinion/16252939.htm