In fact, the very word 'propaganda' is designed to imply the information is disreputable or mendacious, so your opponents spread propaganda while your side has a 'public information', 'public relations', or 'marketing' department. They are trying to force their 'party line' on you, or 'brainwash' you, while you are only trying to 'tell your side of the story'. Can't you see the difference?

Actually, this distinction is primarily linguistic. In other languages, the very term 'propaganda' (that which is propagated) carries no moral or political baggage, it is emotionally neutral. The Vatican has a Propaganda Office (for the Propagation of the Faith), and in Spanish the word is often used as a synonym for 'advertising', or even for material like brochures and training manuals.

But in America, propaganda is what the Nazis and Communists do. WE wouldn't resort to that sort of tactic ourselves, but THEY can be counted on to do so. The very act of calling something 'propaganda' is to imply that it is not to be believed. It is easy to do this in English, a language perfectly suited for hypocrisy and evasion. It may be because, unlike Spanish and Italian which were derived from the extraordinarily precise Latin; English borrows heavily from the cruder tongues of primitive Nordic and Teutonic barbarians and other illiterate savage tribes.