I think that it extends further, and by no means for the benefit of the Iraqi or Muslim countries.
1. The oppressed. I dont mean those that have only been oppressed by Saddam, but those that have been oppressed by international forces also. The people of Iraq, Iran, Kuwait, etc who have been used as a public 'proving' ground for both sides. They have suffered thru the inadequacy of previous 'liberation' wars by all sides. Now its a case of better the devil you know than the devil you dont know. Their families are still starving & getting maimed no matter who is in power. Generations over the past 30 odd years are now growing up knowing they will be pawns in some ones game, so why not fight for the side that will offer a financial reward for their efforts. They have the mighty $$$$ waved under their noses & propaganda to sway their opinion. Check out the ages of the majority of these suicide bombers. To them, a noble way to die in aid of fellow countrymen & their family will be supported well afterwards.

2. Career fighters. Which can be split further into, those that just enjoy a fight & will fight for whichever side is offering the most, and, those that have gripes against thier own govts & will use whatever causes suits them to fight against it. Most aren't even muslim or islamic, or anything. It's just a good reason to get into a fight, mercenaries.

3. Those who profit from their activities, can also be split. There are countries that will have lucrative contracts jeopardised if Iraq, etc demonstrates even the slightest western influence. There are also countries that have huge loans outstanding to Iraq, etc, they fear they will not be compensated. Then there are major corporations at work who will benefit one side or the other. These corporations are not above hiring mercenaries to thrawt efforts by either sides.

Fingers can be pointed in many directions. There are many that are profiting from terrorism, because terrorism causes confusion & fear. The terrorists themselves are dispensible. People not of military, financial or of profile. I often wonder if provided with a viable 'out' if they would still be laying their lives down in someone/thing elses name. To have a 'belief' you have to be given something to believe in.

We cant control our own society. What arrogance is at work to think that it can be controlled elsewere. Whether the war against Iraq was called for or not, I find it naivee for people to think it was going improve by anyones standards so soon.