My first thought about the enslavement is that the threat of killing their family would be a powerful disincentive to turn on the cartel. Either way this is tragic, I feel for all those affected by this.
I also don't agree with the sentiment that the intellect of these people would lead them to turn the tables on their captors. Are you really going to risk having your whole family eradicated? I think it would only take a couple surveillance pictures of all of their family members for them to cooperate even if they realize there is no way they will make it out alive.
Yes - Bunker's commentary (he's the War College professor) seems overly generalized and a bit weird. "Prima donna's"? How does he know know "hacker types" don't function well in captivity? Was there a study?
But there's not a single case, there's 100% leak prevention. You'd think at least one family would have fled and made it known. Nobody but dead men run opsec that tight, right?