If we're assigning blame for nihilism and Iraq, let's not forget that WaPo, NYT, CNN, ABC, FOX and the rest of the pro-war media bear orders of magnitude more responsibility than fucking 4chan.
I can't make the connection you make. When people were protesting against the Iraq War, they were told that they didn't believe in anything. I don't understand personal tragedy as an argument against 4chan; everybody you know is going to die eventually, and virtually everybody you're speaking to has known two people who died prematurely and preventably. I, in particular, don't understand people who traveled to kill instead being killed as an argument against humor.
The idea that a 4chan that didn't exist created Judith Miller is bizarre.