There is no doubt that Israel has nuclear and probably thermonuclear weapons. They don't deny it. They simply do not comment one way or the other. Inspectors are not relevant. Nor do Pakistan, India and N. Korea allow inspectors in. They are all members of the Nuclear club and it is well known and there is no going back. That is totally not the point. Iran has nukes but they get them from Pakistan and they are not compatible with their missiles. The goal is to prevent Iran from obtaining its internal capability or any other additional nation for that matter and that can only be done by making the consequences for going forward or appearing to go forward so dreadful that they stop and allow the world to be sure that they stop. Iran has got to be the test case for no new members.
Clashes between IDF and protesters in Bethlehem and East Jerusalem (Reuters)
from the article: Iran pushes foward plan to review ties with UN nuclear watchdog