Jennifer S. Altman New York Times Tony Kushner, left, E. L. Doctorow and Thane Rosenbaum watching a scene from the HBO version of Mr. Kushner's play "Angels in America." The discussion was supposed to be about Julius and Ethel Rosenberg, ... E. L. Doctorow was there, ... So was Tony Kushner, who placed the ghost of Ethel Rosenberg at the deathbed of her prosecutor Roy Cohn in his Pulitzer Prize-winning play "Angels in America." snip "Do artists worry about getting it right at all?" asked Thane Rosenbaum, a novelist and law professor who served as the evening's moderator. "Is...