OK forget humanity. Examine your goals. Do you want to leave Iraq with dignity and some sense of victory or do you want to be bogged down for the next thirty years then leave with your tail between your legs a la Vietnam? If you want the former then you have to get the population on your side. This is not done by offering them martyrs.
It is what, forty years since we left Aden? We are still hated in Crater. I sit in the pub with a couple of Argyles who have not got over what they did. Though admittedly one of them wishes he was still doing it but he is totally bolo. Unless you kill most of the population, all wars end in negotiation. If you have acted honourably then negotiation is easier.