Probably a mathematical model of human societies accurate enough to predict how they react to carefully tailored messages inserted into popular media and how to

Probably a mathematical model of human societies accurate enough to predict how they react to carefully tailored messages inserted into popular media and how to use this to control their behaviors. The world's most advanced militaries are useless when their societies refuse to use them or turn them on themselves in civil wars. As individuals, the effects of such a weapon would be almost invisible as it targets the behavior of humans when they interact as a group. Even if you consciously knew this is going on, society as a whole would still unconsciously follow the playbook planted for it.