Max Fisher in Vox points out I can't get over this giant contradiction in Iran hawks' case against the nuclear deal "Iran hawks are making their case in a way that exposes a very telling contradiction in their arguments, one that is so brazen and transparent it is almost hard to believe. If you look at what they've said in the aggregate, an odd position emerges: Delaying Iran's nuclear program for 10 years via diplomacy is bad, whereas delaying it for two years via war is good. What does that tell you?"
He quotes Robert Farley, a professor at the University of Kentucky:
What the hawks want is indefinite militarized confrontation between the United States and Iran. From the perspective of Israel and Saudi Arabia, this is hardly irrational. Iran supports terrorist groups and other non-state actors that like to mess with the Saudis and the Israelis, and both the Saudis and Israelis would like to have the military capabilities of the United States at their disposal. Nor is it irrational for the Saudis and Israelis to believe that the US will come through with this kind of support; the entire GOP Presidential field (with the possible, partial exception of Rand Paul) seems committed to making it happen.
... And for someone who really wants a semi-permanent guarantee that the United States will threaten to bomb Iran, only nukes work, even if nukes aren’t the central concern. As Fred Kaplan has noted, the really big problem for Israeli, Saudi, and US hawks is that the deal might work, that Tehran might take nukes off the table, and the Iran might reintegrate itself back into the community of nations.