Great video Eric,
per hoc aditum - The Orphanage
We must also consider the option that, if they exist, this group (and they all act under the jurisdiction of a single overriding doctrine whether they are one race/group or not), is using the noisy, primitive and clueless presence of humanity in order to hide and shield itself.
As an insurgent organization might move its command operations into the basement of an orphanage, so that it cannot be easily bombed by any opposing outside force. They would both hide from the orphans, and yet leave the orphanage pretty much alone (allow it to function naturally) - save for grabbing some resources and food. Despite the insurgency's extensive resources, they would not 'solve' any of the orphans' problems for them, because that would look suspicious. Let the orphans suffer. No vehicles, no power generators. They are orphans. Suffering orphans are natural.
Just make damn sure that the orphans believe that they are alone - and that there is nothing but the orphanage (essentially).
An orphan is up late at night, hungry and in his sleepwear, walks into the kitchen carefully with his toy gun, piercing the darkness. Suddenly, in walks a man in combat fatigues, boots with a LAW rocket launcher over his shoulder. The man walks over to the cooler and removes a carton of milk. He drinks half of it directly from the container, then glances at the orphan standing there with the toy gun, and walks out. He could give a shit about the orphan. They don't respond to our play-acting war - fighters, radio calls, interdictions and IFF transponder interrogations - because they don't give a fuck about us. They are the real deal - we are simply children with toys.
The insurgents do not have a relationship/feelings with the orphans because they have rigged the orphanage with (nuclear) charges set to blow (they gave them to the orphans as 'toys' for use in manipulating each other - but the orphans do not understand their real purpose), a useful threat if a manual intervention by outside forces loomed on the horizon. They cannot establish relationships with that which they might have to utterly destroy, in order to survive. You do not make pets of cattle in a beef business.
In this manner, the orphans are held hostage, without their knowing. They only know their immediate suffering - food, bathing, a place to sleep, to not get beaten or put in isolation. The orphanage workers, ignore and keep silent about the command base, because nothing good happens when that pathway is broached. They live in silent fear and never speak of it.
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Now an opposition intelligence agent meets one of the orphanage workers at the market one late afternoon. She is initially terrified to even speak with him and begins to walk off fast. But he tells her that his father, was best friends with her father, years ago. He shows her pictures of a place which she grew up in, long ago. A time much more wonderful and joyous, a time almost forgotten. They chose him for just this meeting, for this reason. She remembers him. She trusts him.
He further outlines that a ruse is about to be set up. The orphans will be quietly and quickly removed, along with the staff, from the orphanage. None of the staff, nor the orphans should know about this - but they are telling her because they need her help in pulling it off. She agrees to help, and also agrees to complete silence on the matter. He hands her a list of things she needs to do, and the date and time in which this need happen.
There would be no 'investigations of the basement', no 'need to investigate the basement', orphans who asked out loud if they could look into the basement would be punished and socially mocked. Orphans who saw uniformed insurgents or their weapons, would be accused of seeing things, would be put in solitary time out. Most of the enforcers of this embargo (useful idiots) would not have the first clue that it was even in place, they would simply follow along through Asch Conformity; gaining social ranking if they followed along with exuberance - deeming ignorance to be 'scientific' or that 'God' had ordained that things be this way, so you would be offending god if you were to question his ordained system.
Silent partners in opposition.
The insurgents would hide most of their base of operations, but not care if they were seen every now and then or not, just so long as their presence was not alerted to outsiders.
The knowledgeable orphanage worker would obfuscate the presence of the insurgents or her involvement therein from both the other orphanage workers and the orphan hostages themselves, at all costs. Bide her time until she was to do the things which were outlined on her list.