I am reminded of that scene in Godfather 2 where the revolutionary jumps into the governor's car and detonates a bomb. Viewing this, Michael Corleone solemnly and knowingly intones that "people who are willing to die for their cause are impossible to defeat" or something similar. This, for the Left, has always been the conventional wisdom. Osama could not have avoided this message in recent lefty culture.
That's because for them ideas are the only thing that matter, people are only there to put the ideas into practice.