"potentially stirring civil unrest in a nation with a 14 percent unemployment rate."
There's already unrest in Iran, AP. And a lot of uprising is against that country's leadership -- a VERY good thing.
14% unemployment is not that high- to overthrow the government, it'll take more than just an embargo.
I agree that there is unrest in Iran, but it isn't unified under one leader/group. That, and the current regime has shown itself to be pretty resistant when faced with internal challenges.