What's in a slogan?

The point of public relations slogans like "Support our troops" is
that they don't mean anything. ... That's the whole point of good
propaganda. You want to create a slogan that nobody's going to be against, and
everybody's going to be for. Nobody knows what it means, because it
doesn't mean anything. Its crucial value is that it diverts your attention
from a question that does mean something: Do you support our policy?
That's the one you're not allowed to talk about. -- Noam Chomsky