Perhaps it is not a question of the strengths/weaknesses of the insurgent. Perhaps it is, instead, the feelings of the indigenous population (the fish among whom the guerrillas swim). I suspect that the average folks would prefer jnust to be left alone. As long as the guerrillas do not disturb the locals' life style too much, they are alllowed to do pretty much as they see fit. Once they start to disrupt the locals' lives too much, then things start happening.
I doubt we are looking at local complicity with the insurgents. Rather, I think we are looking at local apathy, especially in cultural milieus marked by Inshallah and other fatalistic world views (such as those espoused by many east Asian religions). I would submit that we are dealing with inertia here--inertia of rest. Let the guerrillas or the COIN forces disturb that local inertia at their peril. Apathy would be replaced with antipathy. The Islamic insurgent in an Islamic country may be freer to act simply because he is less likely to disturb the cultural status quo (what I just described as inertia of rest).
To return to one of Troufion's original example, Lettow-Vorbeck was able to operate in East Africa simply because he was leading a group of locals who understood the culture of the area in which the operated. The British (with their West African carriers) and Belgian forces were complete outlanders, even more so when they brought in troops from their Indian and South African forces.
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