Filmmaker Michael Moore said Friday he wasn't sure he did the right thing by saving footage of U.S. American soldiers' cruelty toward Iraqis for his controversial documentary, "Fahrenheit 9/11,'' instead of releasing the evidence earlier when it might have helped halt such abuse. "I had it months before the story broke on '60 Minutes,' and I really struggled with what to do with it,'' Moore said in a telephone interview with The Chronicle. "I wanted to come out with it sooner, but I thought I'd be accused of just putting this out for publicity for my movie. That prevented me...