Is it legitimate to discuss assassinating the supreme leader of Iran, Ayatollah Ali Khamenei? Is it legitimate to kill a head of state, except in the rarest of cases? If so, which head of state is a legitimate target and which is not, and who decides? Who is to say that Khamenei may be assassinated but Benjamin Netanyahu may not? That Vladimir Putin may be killed, but not Donald Trump? Which of these poses a greater danger to the world? It's all in the eye of the beholder.

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