With all due respect, that's terribly naive (or, you think we're terribly naive enough to believe it.) Pollard wasn't the first, and he certainly wasn't the last.
In any event, Israel has a nuclear deterrent, even if they like to coyly lie about it. In the fantasy scenario where America no longer supports Israel, they'd manage just fine on their own. But again, that's not going to happen. Too many Americans think it a matter of religious imperative that they and their politicians continue to support Israel, no matter what.