‘Cause there isn’t a clear path to “finishing it”. The best definition of anything resembling an endgame we’ve gotten is an ornery blond press secretary snapping back at the press something to the effect of “it’ll be over when the president, in his infinite wisdom, decides it’s so”. You may feel differently, but I don’t find that approach exactly confidence inspiring. At this point, “finishing it” could mean anything from cutting a deal tomorrow that keeps the hardliners in power to another forever war that lasts decades and doesn’t accomplish much, if anything more. We’ve been told wars have been won or will be finished soon in the very recent past, only to have them drag on for years on end. How many months or years are you willing to let this one run before you have the epiphany that the juice wasn’t worth the squeeze after all?