I think our "negotiators" are really working with the Iranians to assure that Iran has the time and resources to attack Israel and then the rest of the West. There was even a report posted some time ago on FR that the French said the US representatives were acting more like Iranian representatives trying to convince the rest of the Western negotiators of the Irnian position.
Actually as I recall it was an Iranian journalist covering the talks who newly defected who made those statements.