Are you suggesting that, should all forces retreat from Iraq right now, the country would not be torn apart? With the Sunnis, the Shiites and the Kurds all willing to fight for an iraq under them it would not take long before it would end up in civil war ending in the creation of serveral small countries. It took a dictator to force these people to live together in one country (often by brutal repression by said dictator)
You seem to think I'm implying the existance of some sort of mysterious power driving people to live together in one country under democracy, whereas i am actually saying that in the case of iraq people (due to their different beliefs and their unability to reconcile these differences any time soon) are driven away from eachother which would cause the end of one uniform country (Iraq)
If you remember your history this is how Saddam got to power in the first place, due to Al-Bakr's inability to keep the country together. If you don't take my word for it, maybe you'll take wikipedia's:
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Saddam consolidated power in a nation riddled with profound tensions. Long before Saddam, Iraq had been split along social, ethnic, religious, and socioeconomic fault lines: Sunni versus Shi'ite, Arab versus Kurd, tribal chief versus urban merchant, nomad versus peasant. Stable rule in a country torn by political factionalism and conflict required the improvement of living standards. Saddam moved up the ranks in the new government by aiding attempts to strengthen and unify the Ba'ath party and taking a leading role in addressing the country's major domestic problems and expanding the party's following.
It is also because of Saddam's brutal policies to keep iraq united that these sides hate eachother even more than before Saddam's rise to power.