JHE
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2) Just because Iran may achieve nuclear weapons does not mean they would or should use them.
3) Both Iran and Israel having nuclear weapons creates a MAD mutually assured destruction state in which neither side would be wise to envision a first or pre-emptive strike because of the retaliatory strike that would follow.
(Emphasis added)
True.
However, if and when Iran has nukes, would and should Israel trust Iran not to use them to wipe out Israel?
Most people are deterred by nukes. The world saw that work in the end during the Cuban missile crisis. However, not everyone is deterred. It seems incredible now, but there were Cubans who were very angry at the Soviet government's backing down. 'Nikita, little poof, what is given is not taken away,' they chanted in Havana in protest at the withdrawal of the missiles.
Are some 60s Communists the only people nutty enough to favour nuclear war? I don't think so.
In the Iran-Iraq war, the Iranian Slamists had a special way of clearing minefields. They sent groups of boys running across the minefields to set off the bombs. Why not? After all, the boys, as martyrs, were sure to go to Paradise.
The Iranian Slamists scream, 'Death to Israel!' Do they not mean it? Are they not really anti-Zionist fanatics?
Two ways in which nutty Slamists in Tehran might decide the best thing to do is to fling nukes at Israel:
They might well think
1. A good enough first strike could so very nearly wipe out Israel that there would be little or no come-back.
or (more likely)
2. Israel would have some capacity to hit back, but Iran is a much bigger country and, despite massive casualties, would survive. The dead Muslims all go to Paradise and the survivors become the earthly heroes and leaders of Islam.
How confident should Israelis be that the Slamists in Tehran would not believe either of those things?