It's simple, really- it requires a certain recipe.
The first ingredient is the belief that they deserve absolute control over can their children and can do whatever they want to them. The second is a certain mental weakness- the sort that can be exploited by cultists. The third is deep pockets.
That's really about it. The actual mental state, addiction, etc of the child in question is largely irrelevant. Snake oil to cure imaginary problems. Naturally the kid will probably severely hate them once it's all over, but they weren't smart enough to figure that out in the first place and they just insert the kid's actual behavior into their fantasy, much as a sleeping person might dream of winter if the blanket falls off.
As for the programmies themselves, I have insights into their mental state that I seriously don't want to share. Imagine hardcore bondage, domination, and regression fetishists, without the safeguards that prevent ordinary fetishists from acting out their fantasies on the unwilling or the underage.
I don't like getting inside any of their heads- it ain't pretty in there.