how so?
they havent used them ever, and they were a secret until exposed by vanunu. I think the reason why theyre still existing today is that they have a very strong military, not because they have nukes that were a secret for a large part of israels existance.
Nuclear weapons are far more useful as a deterrent than as a combat weapon.
And the decisionmakers around the world knew that Israel had them long before Mordechai Vanunu went to the London Times.