Well, Why Not?

Iran was already going to get to limit the citizenship of inspectors to countries with which it has normal relations. It was going to get to sign off on each individual inspector via a background check by its spy agency. So why not just let them use their own experts to inspect their military facilities?

[T]he agreement diverges from normal inspection procedures between the IAEA and a member country by essentially ceding the agency's investigative authority to Iran. It allows Tehran to employ its own experts and equipment in the search for evidence for activities that it has consistently denied - trying to develop nuclear weapons....

The White House has denied claims by critics that a secret "side deal" favorable to Tehran exists. U.S. Secretary of State John Kerry has said the Parchin document is like other routine arrangements between the agency and individual IAEA member nations, while IAEA chief Yukiya Amano told Republican senators last week that he is obligated to keep the document confidential.

But Republican critics are bound to harshly criticize any document that cedes to Iran the right to look for the very nuclear wrongdoing that it has denied committing.

Kerry says he's been briefed on this and is OK with it. Clearly our real goal cannot be to stop their nuclear program. It makes me wonder if our real goal to raise their self-esteem. Iran's got a space program too, you know -- at least, they claim that's why they want advanced ballistic missiles capable of hitting precise targets.