>put themselves into situations and contexts where they are overloaded with propaganda,

Ah, yes, most of us are independently wealthy and have the financial freedom to avoid working in lobbies blasting fox news all day.

Yes, people can have agency if they choose to, most choose not to because it takes a massive fuckton of energy to do so. But you created society all by yourself from first principles right? Oh you didn't.

The thing is, especially in the modern world with so much media everywhere all the time, we are being subjected to propaganda in nearly everything we do. News, advertizing, lifestyle, all are imbued with propaganda. Some of it's obvious to you and you can quickly discount it. Other parts of it are something you've grown up with and you don't even have the first clue that it is propaganda.

Simply put your feeble human mind cannot comprehend nor perceive the ground truth of all reality and therefore we're subject to the biased and filtered information we receive from others.