When antiwar speech turns seditious They've trashed 9-11 memorials. Blocked streets. Burned flags. Shut down bridges. Marched on Broadway. And trampled across the National Mall. They've thrown stones at a uniformed female member of the Vermont National Guard, and hurled pie at a Bay Area television reporter deemed too pro-war. They've carried signs that read "We support our troops when they shoot their own officers" and "Don't impeach Bush . . . execute him." They've publicly wished for "a million Mogadishus" and privately hoped for 100 new bin Ladens. They've issued manifestos calling for sabotage of military establishments in the...