My guess is that Obama doesn’t know much about the Monroe Doctrine. His knowledge of history is overwhelmingly insufficient.
You are quite correct about the involvement of Iran. It is extremely dangerous.
To Barack 0bama, history began in 1960. Everything that happened before then is irrelevant.
He knows about the Monroe Doctrine. It was by dead white imperialist oppressor males /postmodern deconstructionist Marxist mode.