Mark Hosenball sezs so:

According to this official and other U.S. experts, Israel does not possess conventional weapons capable of knocking out the facilities. Breaking through the thick shell would require, at minimum, several bunker-buster bombs striking precisely the same spot. "These targets would be very hard to destroy," said former U.N. nuclear expert David Albright. Theoretically, Israel could do a lot more damage with a nuclear strike. But U.S. and other Western experts say there is no reason to believe the Israelis will abandon their policy against shooting first with nukes.