It has been said that the United States was deceived into entering and expanding the Vietnam War by its own overoptimistic propaganda. The record suggests, however, that the policy-makers stayed in Vietnam not so much because of overly optimistic hopes of winning... as because of overly pessimistic assessments of the consequences of losing.
The real war: the classic reporting on the Vietnam War with a new essay (ed. Pantheon, 1987) - ISBN: 9780394755502