Why America could not finish war with Iraq in 6days/ 6weeks or 6 month?What is so great about Iraqi insurgent?

America could have finished it in a day if we wanted to. We believe in conventions where we don't kill non-combatants. The iraqi insurgent is a coward and faces us with suicide bombers, ied's and children. The terrorist manipulate the men, women and children to suicide bomb things. Our goal is to help them establish government over there. If we were to fight face to face the country would be demolished in haste.