Maybe, but Israel might feel that to do nothing is simply too dangerous. At some point, by doing nothing, Iran will have a bomb and soon. To do something, even take out a few critical components, might give them time.
Iran plays a game in which they either hope no one will call their bluff, or they do want someone to try and stop them.
In either case, if you were Sharon's successor, and had to decide now, what would you do?
Meant to add:
Either way, it's win/win for the Mullahs. If no one stops them, they have their bomb. If Israel/USA attack, they can crack down domestically and use that as the "I told you so! See why we need a nuke!" moment.