Exists to police the NPT. Israel was never a signatory to the NPT, Iran is. If Iran wants to obtain nuclear assistance - they just need to abide by the rules. However there is abundant evidence - as the IAEA stated - that Iran is pursuing nuclear weapons. Israel has nukes - has had for 40 years - but never used them. It has helped peace because its neighbours realized that even if they defeated Israel - they'd all die. So no major wars. Iran however believes that if they create a large war - the 12th Imam will show up. That is why they want nukes.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Russia: UN report on Iran nuclear program is biased, unprofessional