A couple of thoughts:

Bill Lind probably has the "will" issue expressed a bit better in his 4GW literature. Radical Islam has an advantage because of their strong belief in the correctness of what they believe. The same is true for Christians, or any group with religious conviction. There are things that are more important than preserving temporal life at any cost. Most modern western societies have lost this belief, because in reality these people don't believe in much of anything, thus no principle is worth it to the risk of their lives. Any group that has a strong belief in the righteousness of their cause will have an advantage over those who do not have a strong belief in the value of what they do.

"The moral is to the physical as 3 is to 1." Napoleon

The GC recognizes militias as combatants under the laws of war. You can take yourself out of that realm if you wish, but how do you expect to convince others (including your fellow militias) that you stand for civilization and the rule of law, when you don't play by any rules at all?