There’s an old-fashioned word for this: corruption. In corrupt systems, a few bad actors cost everyone else billions in order to bring in millions – the savings a factory can realize from dumping pollution in the water supply are much smaller than the costs we all bear from being poisoned by effluent. But the costs are widely diffused while the gains are tightly concentrated, so the beneficiaries of corruption can always outspend their victims to stay clear.
Facebook doesn’t have a mind-control problem, it has a corruption problem. Cambridge Analytica didn’t convince decent people to become racists; they convinced racists to become voters.