If you're not convinced the 2001 terrorist attacks on the United States changed everything, ask yourself this: If anybody had told you on September 10 that the talk of early-21st-century Hollywood was going to be an action feature film in which marionettes play celebrities and world leaders, would you have believed it? That, as everybody now knows, is the idea behind Team America: World Police, a new film, opening Friday, written by South Park creators Trey Parker and Matt Stone (with Pam Brady), and directed by Parker. The premise: a team of American hotshots save the earth from terrorist evil,...