Whenever liberals remind us that not all Muslims are terrorists or anti-American rioters, I always think that not everyone in the pre-civil-rights south was a church bomber or member of the Ku Klux Klan. ...Which brings me to Inside 9/11, a new four-hour documentary that premieres Aug. 21 on the National Geographic Channel. The producers have been promoting this two-night special, which the cable network considers so important that it's making the show available for free in areas that don't carry NGC, as strictly reportorial rather than political. And as far as possible, this is true: The documentary, which features...