What ethically challenged billionaire would not welcome the journalistic cosseting of Ben Mezrich? With each new book, Mr. Mezrich becomes increasingly adept at how to use his kid gloves. He is expert at making up conversations he did not hear, sexing up parties he did not attend, pumping up the thrills of getting rich quick and playing down the legal liabilities of characters who may have done a teeny bit of innocent law-bending or moral compromising on their ways to the top.