Law is for all of course. But who told you Israel has an atomic arsenal? Did Israel sign the NPT, like Iran did? Iran doesn't keep the rules. Iran is playing cat and mouse, hiding their nuclear facilities which according to the treaty should not be. Why they don't get out of it? Make things clear? Israel repeatingly expressed her point of view: She will never be the first to introduce nuclear weapons to the Middle East.
U.S. confirms ISIS computer expert killed in air strike (Reuters)
from the article: Ahmadinejad: Strike on Iran will cause enemy's destruction