All the branches of Establishment PR power function, IMHO, to make myths. Sometimes the myth is reality--Reagan as good guy, proven out in real life--but the myth is built more-or-less independently of reality.A topical example of myth is the "courageous liberal writer" fighting for freedom of speech and freedom of association against viciously repressive Senator McCarthy. In real life the threat posed by the senator was actually to real Communists, many of them now known explicitly to have been actual agents of the Soviet Union.
But the whole PR apparat went into overdrive to build that myth, in which all each part of the apparat scratched the backs of all the other parts. In the resulting popular mythology, all parts of the PR apparat become heroes except for whatever remnant of character here and there (e.g., Ronald Reagan) refused to go along and get along.
The appeal of the myth is so powerful that few have the character to decline its allure.