The street vendor in Times Square's theater district who called the cops about an explosive-laden SUV had a message for New Yorkers: "If you see something, say something." But for normally talkative entertainment professionals -actors, directors, writers, producers - the watchword continues to be, "If you see something, shut up." Avert your eyes from the death threats against South Park's creators, when their home addresses are published on the web, along with a photo of slaughtered Dutch filmmaker Theo Van Gogh. Refrain from issuing a statement of solidarity, either individually or through your union. Zip your lips when Comedy Central...