I don't think you understand. See, the US army won't lose. They will win, and all the sacrifice they have offered will sustain the sense of victory when it eventually is declared. Hell, Vietnam is still remembered by a suprisingly high amount of people to have been worth it, even if it wasn't a eh.. definitive success. Do you think that something similar will not happen now? That defeat will be declared and that the army will withdraw and let the armed factions split the land between themselves? "Sorry, our mistake. We'll be leaving now. Hope you're not sore. Have a nice aftermath, now. We'll just turn our backs now, as you were people". And then to the american public: "sorry for all the wasted lives, all. No hard feelings, right? We did what we thought was best but we failed. Sorry". The question, friend, is how many americans will be killed and how many "insurgents" will be blown away before "victory" happens. At which time I will eat my hair if there isn't some asshole who declares that "In spite of all, America triumphs! We shame old europe and their pessimism now! All hail the ultimate power of the US and the perseverence of our president and the american people".

In other words, it's not I who take pleasure in american deaths.