Some on the Left in the 1960s demonized the U.S., calling it an imperial and immoral power, which did not help to end the war in Vietnam. Demonizing by the Baader-Meinhof gang and by Japan's Red Army did nothing to bring about the justice they believed in. Neither did demonizing the police. . . Do Not Oversimplify . Avoiding demonization merely requires appraisal with detail.
Demonization is always an over-simplification.
And over-simplification was a scourge on the 20th century. So too was narrowing the blame to arms producers and traders. Going into World War I, the Germans had a strategy that was too simple. German strategists erred by measuring benefit in the pursuit of war only in terms of military matters, the Schlieffen Plan bringing Great Britain into the war on the side of Belgium and France. Hitler was over-simplifying when he put his hopes on military might alone.