There is a number of things about iran that confuses me. Prior to their revolution (1978?) they were a westernized country, and one of israels closest allies. You would assume that the older population would remember those times and would welcome a free society.
During their recent elections, it was revealed that well over 50% of their population is under 25. Now, ask yourself how is that possible? A surge in births could not account for all of that, there had to have been massive execution campaigns.
Of course a younger population is much more easily attracted toward the use of force.
As for Israel, its not as simple as it looks. They've learned from the iraqi nuclear reactor lesson, and made sure their nuclear program is dispersed in several THOUTHAND locations, most are underground, and under heavily populated areas. Not something that can be easily bombed. It could perhaps be infeltrated and sabautaged, but that that is not an easy task, even for mossad.
Combined with the estimates that they could be only months away from a nuclear weapon, not years, and a working delivery system, prompted the israelli effort to invest and develop anti missile technology. However, such a system is not full proof.