William S. Lind describes the power of weakness:
Imagine that instead of facing rag-tag bands of poorly equipped and trained insurgents, our Marines and soldiers in Iraq were in a very difficult fight with an opponent similar to themselves, but somewhat stronger.
What would fighting the strong do for them? Being David rather than Goliath, they would see themselves as noble. Every victory would be a cause for genuine pride. Defeats would not mean disgrace, but instead would demand greater effort and higher performance. Even after a failure, they could still look at themselves in the mirror with pride. Knowing they faced a stronger enemy, their own cohesion would grow and their demand for self-discipline would increase.
If the enemy’s overmatch were too great, it could lead our units to hopelessness and disintegration. But a fight with an enemy who is stronger but still beatable would buck us up more than tear us down on the all-important moral level.
Now, to see the situation as it is, turn that telescope around. Every firefight we win in Iraq or Afghanistan does little for our pride, because we are so much stronger than the people we are defeating. Every time we get hit successfully by a weaker enemy, we feel like chumps, and cannot look ourselves in the mirror (again, with IED attacks this happens quite often). Whenever we use our superior strength against Iraqi civilians, which is to say every time we drive down an Iraqi street, we diminish ourselves in our own eyes. Eventually, we come to look at ourselves with contempt and see ourselves as monsters. One way to justify being a monster is to behave like one, which makes the problem worse still. The resulting downward spiral, which every army in this kind of war has gotten caught in, leads to indiscipline, demoralization, and disintegration of larger units as fire teams and squads simply go feral.