Secretary of State John Kerry went to Hollywood this week in search of ideas to counter the Islamic State’s appeal. And to be fair, he was onto something: the power of narratives and emotional appeal of stories have a role to play in beating back a hateful ideology. And American moviemakers know how to tell great stories with global appeal, as foreign box office sales can attest. The medium is right, but the message — or rather, the “American brand” — is not.