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It doesn't need to be a war at all.
However, it is a war, and Trump has declared the only acceptable end is unconditional surrender and Trump himself having a say in the new leadership, so it is a regime change war (but, yes, completely unnecessarily so.)
But chill out, Americans say. We only demand that the Ayatollah (or any other Ayatollah) doesn’t exist/are dead. Why do you have to be so, like unchill about it?