Supposedly the most famous British atrocity story concerning the Germans during World War I was the "Corpse-Conversion Factory"-rumor; it was said the Germans produced soap out of corpses. A story, which got so well believed that it was repeated for years - without a clear evidence of reality at that time. (
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The cutting of pictures in movies or photographs is highly manipulative: it is easy to produce a new video out of an already existing one. The result is a form of manipulation that is difficult to contradict. A reputation destroyed by this, is nearly impossible to heal.