Successful nuclear deal would help Iranian democratic reform movement
Third, the deal will help unleash Iran's vibrant, young (the median age is 28!) and moderate society, which is continuously pushing Iran in a democratic direction. The deal enjoys solid support among the Iranian public as well as among Iranian civil society leaders, partly because they believe the deal "would enable political and cultural reforms."
America benefits if the democratic aspirations of the Iranian people are increasingly met, because a more democratic Iran is a more moderate Iran.
This is particularly important at a time when the violent winds of religious radicalism are ravaging the Middle East and beyond. America is in desperate need of an injection of political moderation in the region. An Iran that moves towards democracy could provide that.