That's an oversimplification of reality. Iran indeed has some influence over Iraq due to their religious commonalities. It's meddling in the affairs of others as much as others are meddling. For example, see how much Saudia does in Pakistan through funding and controlling some religious parties. In Syria, Iran is involved in protecting the Syrian regime just as much US, Israel, Saudia, etc are involved in toppling the current Syrian government as they don't play ball with their foreign policy. What I'm trying to say is that your vision is a little myopic. After the Iranian revolution, there is a concerted effort by the Arab states and U, Israel to destabilise Iran, with encirclement of Iran, all around with US bases. Hence, it is only natural that they would counter balance such pressure and design by spreading their sphere of influence. I am just being an objective observer here and do not support Iran or Saudia. Call a spade a spade. It's the reality of foreign policy of every country in the World. What you're trying to do is in judiciously scapegoating Iran. That's my point. Everyone is at it. Unfortunately. According to former Malaysian foreign minister, I think, Saudi had spend 200BN dollars since the seventies to push their literalist wahabj ideology around the Muslim world. This sectarian strife that you find in Pakistan, for example, is a direct gift of Saudi Arabia. US has created Iraq, Syria, Afghanistan etc to what it now due to their erroneous foreign policy. Small countries then react. If we were to issue a verdict of guilty then it's everyone and Iran is no angel in all this.