Whatever one thinks about Iran, this bit from D Ross makes no sense:

We need to offer political, economic and security benefits to Tehran, on the condition that Iran change its behavior not just on nukes but on terrorism as well. Sticks will show Iran what it stands to lose by going nuclear; carrots will show its leaders what they would gain by moderating their behavior.

Leaving aside the fact that neither Iran nor the intelligence community say that Tehran is going nuclear, conditioning carrots (God, please kill that stupid metaphor) on terrorism does not show Iran what it will gain if it complies with the United States’ nuclear demands but does nothing on terrorism.