Buchanan is right in that Iran has no desire to attack the United States or to wage war against it. Raccoons don't attack mountain lions.
The alleged and non-existent military threat from Iran (or from Iraq, or Syria, etc) seems like an intentional distraction at times. Insofar as there is a Muslim threat to the western world, it doesn't come from aggressive war, but from immigration and demographic trends. And on the issue of Third World immigration, whether it's the Arabization/Africanization of Europe or the transformation the the US into an annex of Mexico, there is no more stalwart spokesman than Pat Buchanan.
You are wrong. Iran is building missiles that can reach Europe. When it gets nukes it will threaten Europe, Israel and Saudi Arabia with them. We have allies and interests in Europe and the Middle East and Iran will soon be in a position to mess around with them. Russia, China and Iran will carve up the Middle East oil resources and nations. Short of this they will tell Arab oil nation how much oil to sell and to whom and to pay $10/barrel tax to Iran