The first rule of brainwashing is to tell people that they aren’t being brainwashed.
For example tell them that it is a film which they are watching for entertainment. Get them to believe that they are enjoying their ‘freedom’ by ‘enjoying’ leisure products.
Oh. And by the way. If you want to bolster the grip of the arms industry and war machine on the population make sure that the narrative lines feature chaos being overcome by brave Americans with guns and by the US armed forces.
Then people will believe your narrative about how necessary the US war machine is to protect them and their familes from chaos.
If you control the news agenda as well maybe they won’t even twig that it is just this war machine which is causing all the chaos it is telling you it is saving you from.