I think an important if generally ignored point is that not only were war supporters shouting down war opponents over the years, they also did everything they could to shout down people who were suggesting even tepidly that maybe Dear Leader and his Merry Gang of Incompetents were fucking the whole thing up. While I don't have much respect for the "incompetence dodgers" on the question of whether the Great and Glorious Invasion of Iraq was a good idea, it is true that the whole adventure was handled about as incompetently as it could have been by the Bush gang. More than that, this was pretty apparent from the beginning. The pro-war gang will, for the most part, never rethink their support for their pet war, but I'd hope at least a few of them might consider that their blind support for these idiots helped ensure that their pet war, their central mission, was a colossal fuckup.
Oh, and lots of people died too. Mustn't forget that.
