The internal coordination of the iraqi insurgency is an EMERGENT phenomenon--their non-hierarchal makup fundamentally precludes hierarchal, centralized direction and supply of their activity. America's tactical blindness is due to a lack of understanding of the differences in information processing between hierarchy and rhizome. Hierarchy processes information mechanically, it is machine intelligence, much like a computer; there is centralized direction of resources, and information flows in two directions via fixed channels. Rhizome, however, is emergent intelligence, much like the human brain. There is no (or little) conscious coordination between the various nodes in the insurgency, just like there are no controlling neurons in our brain, and yet the human brain and the iraqi insurgency are capable of information processing feats that are beyond the abilities of the most capable computer.
This is why the destruction of 8 bridges will have no impact on a rhizome insurgency. if you open up the human brain and kill 8 critical neurons, it will have no substantial impact on the ability of the brain to produce emergent information processing. Conversely, if you open up a computer, and destroy 8 critical transistors in your Pentium 4, the computer will be severely damaged, possible rendered non-functional. The fact that the US decided to destroy some of the very links that it depends on is evidence that they neither understand their enemy or themselves.
Sun Tzu said:
So it is said that if you know others and know yourself, you will not be imperiled in a hundred battles; if you do not know others but know yourself, you win one and lose one; if you do not know others and do not know yourself, you will be imperiled in every single battle.