O.K.... I know what you are saying. I thought you meant in excess (that the additional 20K troops would cost 100bil) which isn't the case. We are looking at another 5.6bil for the troop increase, and 1.2bil for rebuilding efforts in addition to the 99bil that we have already budgeted for the war. That 100 bil you talk about is already in the defense budget for 07'. Page 3 talks about additional costs:
http://www.msnbc.msn.com/id/16558652/
As to a couple of other things:
1. I don't agree that they are fighting because we are occupying them. They are fighting because factions are philosophically opposed very drastically in ways that encourage violence as a solution, and the only thing that stopped sectarian violence before was a tyrannical and violent leader. They only seem to know how to behave through violence or complete submission; and at the moment they just don't seem to know another way. Because of this, I think that without our occupation, more fighting would be happening with thousands more deaths.
2. Even if we managed to have good diplomacy with the surrounding nations, I don't think that they would be able to keep the different factions from crossing the border (with us not occupying the areas to hinder it) and getting involved in Iraq if they wanted too. Most of these nations have virtually no border security, and the people of these nations identify more with their religious/tribal identities then their countries of origin. So the Sunni's from places like Saudi Arabia will still get involved, as will the Shia' from places like Iran and Syria, and so on.
3. Oil, unfortunatily, is a huge factor here. Not just for "big oil" interests, but for the country and people of Iraq itself. Oil is about the only thing they really have to offer at the moment on the international trade side of things. Without it, there is no chance of economic stability in the region. Because of oil, there is potential for economic stability in Iraq and a rebuilding effort, if they could just stop killing each other for a second to realize it. Without oil, there chances are even dimmer. So, in my opinion, anyone interested in that country becoming stablized at some point had better be greatly interested in securing oil their resources.
4. Because these factions seem to have no abilities to behave themselves, and because Iraq's ordinary people have been beaten down and are so afraid to stand up for themselves, Maliki might just have to institute a form of martial law with strict rules on curfews, insurgent/terrorist aiding and abetting, weapon ownership, and so forth, in the region in order to secure it. This doesn't have to be the rape and torture rooms of the Saddam days, but it should be very strict. I am sure that the families who are just trying to live their lives would welcome such a strict rule.
In fact, part of the reason for the increase in violence is Maliki had restricted US troops from operating in certain Shia area's, so Insurgents and foreign terrorists increased in those areas. That kind of stuff has to stop. There needs to be a strict rule on everyone, regardless of faction. They need to earn their freedoms, because they have so far demonstrated that they cannot be trusted with them.
Supposedly, this is one of the things that is going to change with the new plan. Well, we'll see.
5. I think that we all agree on this, however: it seems that there is no good solution, at least in the immediate. It is like we have the choice between a knee injury, a back injury, a neck injury, or a rotator cuff injury. It's like, none of our choices are really any good. So, I guess we just have to do what we can and hope for the best.