So much to hope, so much to fear from Kathryn Bigelow's Detroit — at least, that's how many of us who grew up in and around Detroit feel about the film Bigelow is directing, based on a script by collaborator Mark Boal, about the 1967 riot. When the trailer dropped earlier this month, a shudder ran through some in the Motor City. "Here, people are so used to negative portrayals, and given the subject matter they're just numb to another one like all the others," offered one…