By Scott Johnson and Babak Dehghanpisheh Newsweek September 20 2004 Issue As Americans debate Vietnam, the U.S. death toll tops 1,000 in Iraq. And the insurgents are still getting stronger. Iraqis don’t shock easily these days, but eyewitnesses could only blink in disbelief as they recounted last Tuesday’s broad-daylight kidnappings in central Baghdad. At about…