The threat, bluster and economic warfare now being mobilised against Iran by the West is delighting both the Sunni dominated middle east and Wahabbi Saudi Arabia. To get the west to go to war against the most powerful remaining Sh'ia force in the region whilst keeping their own hands clean suits the remaining despots very nicely indeed. And the west, as gullible and myopic as ever, seemingly having learned nothing from Iraq, is heading straight into catastrophe.
Far better to call in all those favours from Israel and have that belligerent little nation act as the west's proxy; the animus between Israel and Iran is widely understood, the fight would be a fair one and Sunni chauvinism would be blunted by a Sh'ia 'champion' in the arena with their widely-loathed common enemy. We would, of course, keep Israel plentifully supplied with arms (to the benefit of our own industry), albeit discreetly, and guarantee the integrity of Israel's pre-1967 border. But that's all.