The rest of the article can be found here.
Unlike most mainstream articles Chomsky just assumes that the purpose of US Mid-East policy is to control energy resources. He notes later that the US is probably working within Iran to support separatist movements---many of them using terrorist tactics.

A predator becomes more dangerous when wounded

Washington's escalation of threats against Iran is driven by a determination to secure control of the region's energy resources

By Noam Chomsky

03/09/07 "The Guardian" --- In the energy-rich Middle East, only two countries have failed to subordinate themselves to Washington's basic demands: Iran and Syria. Accordingly both are enemies, Iran by far the more important. As was the norm during the cold war, resort to violence is regularly justified as a reaction to the malign influence of the main enemy, often on the flimsiest of pretexts. Unsurprisingly, as Bush sends more troops to Iraq, tales surface of Iranian interference in the internal affairs of Iraq - a country otherwise free from any foreign interference - on the tacit assumption that Washington rules the world.

In the cold war-like mentality in Washington, Tehran is portrayed as the pinnacle in the so-called Shia crescent that stretches from Iran to Hizbullah in Lebanon, through Shia southern Iraq and Syria. And again unsurprisingly, the "surge" in Iraq and escalation of threats and accusations against Iran is accompanied by grudging willingness to attend a conference of regional powers, with the agenda limited to Iraq.
Presumably this minimal gesture toward diplomacy is intended to allay the growing fears and anger elicited by Washington's heightened aggressiveness. These concerns are given new substance in a detailed study of "the Iraq effect" by terrorism experts Peter Bergen and Paul Cruickshank, revealing that the Iraq war "has increased terrorism sevenfold worldwide". An "Iran effect" could be even more severe.

For the US, the primary issue in the Middle East has been, and remains, effective control of its unparalleled energy resources. Access is a secondary matter. Once the oil is on the seas it goes anywhere. Control is understood to be an instrument of global dominance. Iranian influence in the "crescent" challenges US control. By an accident of geography, the world's major oil resources are in largely Shia areas of the Middle East: southern Iraq, adjacent regions of Saudi Arabia and Iran, with some of the major reserves of natural gas as well. Washington's worst nightmare would be a loose Shia alliance controlling most of the world's oil and independent of the US.

Such a bloc, if it emerges, might even join the Asian Energy Security Grid based in China. Iran could be a lynchpin. If the Bush planners bring that about, they will have seriously undermined the US position of power in the world.

To Washington, Tehran's principal offence has been its defiance, going back to the overthrow of the Shah in 1979 and the hostage crisis at the US embassy. In retribution, Washington turned to support Saddam Hussein's aggression against Iran, which left hundreds of thousands dead. Then came murderous sanctions and, under Bush, rejection of Iranian diplomatic efforts.

Last July, Israel invaded Lebanon, the fifth invasion since 1978. As before, US support was a critical factor, the pretexts quickly collapse on inspection, and the consequences for the people of Lebanon are severe. Among the reasons for the US-Israel invasion is that Hizbullah's rockets could be a deterrent to a US-Israeli attack on Iran. Despite the sabre-rattling it is, I suspect, unlikely that the Bush administration will attack Iran. Public opinion in the US and around the world is overwhelmingly opposed. It appears that the US military and intelligence community is also opposed. Iran cannot defend itself against US attack, but it can respond in other ways, among them by inciting even more havoc in Iraq. Some issue warnings that are far more grave, among them the British military historian Corelli Barnett, who writes that "an attack on Iran would effectively launch world war three".

Then again, a predator becomes even more dangerous, and less predictable, when wounded. In desperation to salvage something, the administration might risk even greater disasters. The Bush administration has created an unimaginable catastrophe in Iraq. It has been unable to establish a reliable client state within, and cannot withdraw without facing the possible loss of control of the Middle East's energy resources.