The last few words of the editorial correctly raise what ought to be the key question in any evaluation of an agreement that emerges from these negotiations, which is to consider whether it “is better than the alternatives.” Except the editorialists don't examine what the alternatives really are. Indefinite continuation of the interim agreement currently in force would be helpful in fulfilling U.S. nonproliferation objectives, but the Iranians would be unlikely to accept being strung out like that, given that they are still under the economically damaging oil and financial sanctions. Besides, hardliners in the U.S. Congress have made it clear they would push hard for agreement-violating, deal-killing additional sanctions if there is no final accord by early summer. So the true alternative is no agreement at all—and that means no special restrictions on, and no intrusive inspections of, the Iranian nuclear program. Yes, let's indeed compare whatever agreement is reached with the alternative.
We should remember the grief that the crusading doctrines the Post has supported have brought us in the past. In particular we might recall the Post's support for the Iraq War, which among much other grief it caused the United States also was the single biggest cause in recent years of the expansion of Iranian influence in the Middle East—specifically, in Iraq itself. Then we might ask where else in the Post's fairy-tale land its current undermining of the Iran negotiations is likely to lead us.