What it the most likely reason Roosevelt uses the phrase "unprovoked and dastardly” to characterize the attack on Pearl Harbor?

Calling the attack “unprovoked and dastardly” presents it as an unjustified, dishonorable act. Roosevelt uses this strong language to persuade the public that the United States must respond by declaring war, and that doing so is justified. The phrase is not mainly about criticizing ordinary Japanese citizens or describing the attack’s effects.

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