It is worth remembering that these Arab regimes are precarious and have populations with views of Iran, and its supposed weapons plans, very different from their leaders. Regime change in Iran would have considerably less effect on the ME than a change in Saudi, Bahrain, Egypt, Jordan etc. Of the two opposing faces, one is to placate the US and the other the people. Which would hold if it came to the crunch?
from the article: WikiLeaks exposé makes it clear: Everybody hates Iran