Wasn't it Walter Cronkite the first journalist who eschewed the tenets of journalism by declaring that the Vietnam Was was unwinnable?
"Cronkite strongly influenced the politics and outcome of the Vietnam War. In 1968 the Communist forces in South Vietnam, facing defeat, staged massive kamikaze attacks on U.S. positions in Saigon and elsewhere during the Chinese New Year celebration called Tet. This suicidal "Tet Offensive" was a military disaster that cost the lives of 100 Communist fighters for every American killed. But as a top Communist general said years later on the Public Broadcasting Service documentary series Vietnam, those on the left in the American press turned this Marxist military defeat into a political victory for the Communist side.
"It seems now more certain than ever," Walter Cronkite told his audience in a de facto editorial, "that the bloody experience of Vietnam is a stalemate" and that the war was "unwinnable." Cronkite's statement and call for U.S. withdrawal helped turn public opinion against the war. It also demoralized American troops and Democratic President Lyndon Johnson, who was said to have declared that losing Cronkite’s support meant he had lost the backing of Middle America." (DiscoverTheNetworks.org)
