It's a lie of diversion / distraction.
Noam Chomsky:
Anything that's totally vacuous and diverts, after all what does it mean to be in favor of .. suppose somebody asks, do you support the people in Iowa, can you say I support them or no I don't support them. It's not even a question it doesn't even mean anything. And that's the point of public relations slogans like support our troops is that they don't mean anything, they mean as much as whether you support the people in Iowa.
Of course there was an Issue -- the issue was do you support our policy but you don't want people to think about the issue that's the whole point of good propaganda, you want to create a slogan that nobody is gonna be against and I suppose everybody will be for because nobody knows what it means because it doesn't mean anything, but it's crucial value is it diverts your attention from a question that does mean something. Do you support our policy and that's the one you're not allowed to talk about.
http://www.chomsky.info/interviews/199201--.htm
http://fixyt.com/watch?v=G7DdWmWUa_8
Incidentally, this passage is within a larger context of public relations. A while back I was looking at terms and phrases on Google's Ngram viewer and noted something really odd: "democracy" wasn't a term in broad use until World War I, with a second major uptick during WWII.
https://books.google.com/ngrams/graph?content=democracy&year...
I noted that and didn't think much more of it for a few months until I ran across a reference to Edward Louis Berneys, father of modern public relations.
http://en.wikipedia.org/wiki/Edward_Bernays
Really interesting coot. Double nephew of Sigmund Freud (oh yeah: Berneys popularized Freud too -- and married advertising to psychology while he was at it), convinced women to smoke ("Torches of Freedom"), and though it's hard to believe it had to be sold, promoted bacon.
One of his first campaigns? A WWI "support the troops" message commissioned by the US government. To popularize democracy.
That's right: the principle American Value was brought to you as a marketing campaign.
(Ngram viewer is fascinating for studying the emergence / rise / fall in the popularity of words and phrases).
More on lies of diversion:
https://plus.google.com/104092656004159577193/posts/5zrCkbzR...