How many Arrow interceptors do they have? Is it 100% effective against any and all countermeasures and different types of warheads and strategies that Iran will adopt? How many MRBMs does Iran have?Israel have arrow defense shield against Iranian ballistic missiles and what Iran have to defend itself from nuclear Jericho 2 intermediate range ballistic missiles and Jericho 3 ICBMs???
Those are all rhetorical questions. You are right that ultimately Israel has the upper hand with nuclear weapons, but not even Israel can use those just for fun. Iran has sufficient enriched uranium for 15-20 nuclear warheads (if further enriched to 90%), and completed testing on an indigenous two-point implosion device in 2003. In extremis, Iran can assemble a nuclear warhead within 1-2 weeks. Also, Israel has a lack of strategic depth, being a tiny entity built on ethnic cleansing and terrorism.