WHERE to strike is the problem. I doubt we even know for certain where everything is. Anything visible is probably a decoy.
Israel no doubt has the best, top notch spies in Iran, but Iran will no doubt have so much security that it's not possible to get anywhere near their inner circle that knows where things are.
The Iranians probably raised every one of their nuclear scientists and workers from birth.
If Isreal stikes and misses, then what?