if they did it with conventional charges, the damage would probably be rather minimal.

If they use nukes, hell will break lose in the middle -east and it's far from sure that even such a strike would have the intentional effect, besides killing a lot of people.

At the same time the Israeli would expose themselves of being nuked in the future. The problem with Israel is it's size. Only 5-10 nukes even with a relative low yield and the country virtually ceases to exist, since 75% of the population is concentrated in 3 cities. The same amount of nukes on Iran would not have the same effect, even if the country would be badly hurt.