Capote Very Naughty

Columbia Journalism Review sums it up

“I didn’t trick him,” Capote countered. “We simply swapped stories. I made up stories about what lushes my family were, and believe me, I made them lurid, until he began to feel sorry for me and told me his to make me feel better.” Capote would expand upon this technique to his biographer, Gerald Clarke. “The secret to the art of interviewing—and it is an art—is to let the other person think he’s interviewing you. . . . You tell him about yourself, and slowly you spin your web so that he tells you everything. That’s how I trapped Marlon.” In an interview with Rolling Stone more than 15 years after the fact, Capote observed, “You remember I told you how startled Marlon Brando was? I hadn’t taken a note. I hadn’t done a thing. I hadn’t even seemed to be interested.”

also


Some of Capote's misbehavior regarding In Cold Blood

Miller delivers a particularly grim vision of Capote: he seduces Perry Smith and then betrays him, lying about the title of his book (which would reveal that he was less sympathetic with the killers than he might have seemed), and refusing to help the men find a new lawyer for their appeals (because only when they were finally executed would Capote have his ending).