Propaganda is more often concerned with self-justification than with convincing others.
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Propaganda is less important in a consumer society where people greet all official pronouncements with suspicion.
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Propaganda is a mass phenomenon... it must circulate in public, reaching and drawing together large numbers of individuals who are largely unknown to one another.
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Propaganda is a soft weapon which if held in one's hands too long, will move about like a snake, and strike the other way.
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Propaganda is an integral feature of democratic societies and is dependent on the printing press, which increased the range and speed of information so that now an entire people could become the target of persuasion.