‘Nobody has a monopoly on making mistakes.” When I was Israel’s ambassador to the United States from 2009 to the end of 2013, that was my standard response to reporters asking who bore the greatest responsibility—President Barack Obama or Prime Minister Benjamin Netanyahu—for the crisis in U.S.-Israel relations.

I never felt like I was lying when I said it. But, in truth, while neither leader monopolized mistakes, only one leader made them deliberately.

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