So great are the psychological restistances to war in modern nations, that every war must appear to be a war of defence against a menacing, murderous aggressor. There must be no ambiguity about whom the public is to hate. Guilt and guilelessness must be assessed geographically and all the guilt must be on the other side of the frontier.

H.D. Lasswell, in 'Propaganda Techniques in World War I'

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