Their nominal argument (for some appropriately loose sense of that term) is something along the lines of: 9/11! Iraq! 9/11! Iraq! We’re going to keep mentioning these things in close proximity! Even at this late date, that will be enough to convince a few of you there’s some coherent connection, right?
The subtext, and actual argument, is that a lot of people have made serious sacrifices in this war, and isn’t it awfully mean to salt the wound by passing public verdict that it was all just a terrible waste? I’m not without sympathy on this front, but not quite so much sympathy that I think it’s worth demanding more such sacrifices to prolong some comforting illusions about the ones already made.