The Germans oppose the treaty of Versailles because the agreement was unfair to them. The terms of the treaty were harsh and the Germans suffered deep humiliation.
Since the Germans had not been involved in negotiating the treaty, a feeling developed in Germany that they were under no moral obligation to obey its terms. They called it a 'diktat' (dictated peace) because it had been imposed on Germany. The German government had sign the treaty but had not agreed to it. The Germans had no say in drawing up the treaty so they could feel free to ignore its terms.
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