The terrorists are encouraged by the reports of American politicians seeking to have U.S. troops withdrawn. Most Iraqi Sunni Arabs see that as a disaster, but the terrorists see it as an opportunity to take on the security forces without having to worry about the much more capable American forces. But with U.S. troops gone, the Iraqi security forces will be inclined to wage war the traditional way. That means massive use of firepower against civilians in any neighborhood where the Sunni Arab terrorists show up, or are found.Source
....So far this year, many more parts of central Iraq have been cleared of terrorists, and the remaining ones know they have to maintain their visibility to survive. Setting off several bombs a day keeps the terrorists in the news, even if the explosions take place in a smaller and smaller area of Iraq. The terrorists play more to the international media, than they do to anyone inside Iraq. The terrorists are already hated and feared throughout the country, even in Sunni Arab areas. There, the terrorists must increasingly divert resources to terrorize Sunni Arabs, and keep them in line. They are aided by Islamic conservatives, who see all the unrest as an opportunity to impose Taliban like rules on the population. If the terrorists accomplish nothing else, they will have shown how to manipulate the mass media, and divert attention from the true origins of the terrorists, and their objectives. It's been a masterful job which, of course, the mass media will have no interest in examining anytime soon. In a generation or so, there will be books and articles about it, but the subject will never get a lot of media attention.
War is always a horrible state. Peace under a bloody oppressive regime or theocracy might be seen as worse, to many people.