There is another lesson of cold war history: The biggest threats of a mutual-nuclear-deterrence-situation are not crazy or irrational leaders, but "misunderstandings" caused inparticular in situation of conflict and high tensions or just by tecnical "mistakes". So the additional risk of a iran bomb is not caused by a crazy leader like Achmadinechad. The additional risk is caused by the fact that there would be a second nuclear power in the region. Israels politic to avoid such a second nuclear power in the region by military means has (in my opinion) come to an end. Even if a preemptive attac against the iran atom program would be successful now: The "success" would be a delay for some years and a much more dangerous situation then. So two things has do be done: In the short run appropriate actions in order to avoid or delay the construction of an iran bomb. In the long run a politic of nuclear disarmament in the region in general. Israels strategy to avoid a second nuclear power in the region by force is coming to an end.
Yemen's Houthi rebels commit to peace plan in letter to UN chief, BBC reports (Haaretz)
from the article: Iran is too rational to attack Israel