I blame ourselves, the UK and US, for stoking the flames of millenarianism in Iran. First we invade Afghanistan, on Iran's eastern border, and then, without completing the Afghan mission, we invade Iraq, on Iran's western border. Chaos ensues on both fronts. Chaos is a precursor to the Twelfth Imam's return. According to ABC News:
The Mahdi's eventual return is an article of faith for Shiite Muslims that taps deeply into Persian consciousness and mystical tradition. Signs began to appear in Tehran three years ago, announcing that "He's Coming."