Propaganda doesn't totally rob people of agency free will (more accurate term), if it did this site wouldn't exist. People do have the capacity to develop critical thinking, skepticism, and a basic curiosity about the world that allow them to develop some resistance to propaganda.
You can hold people accountable for failing to even attempt to do this.
Maybe I'm just different from most people, but my family was fairly well off and as a teenager I still was curious how everyone else was doing. How do we "stack up"? That seems like a fairly common thing.
I'm a white guy, but I still understand systemic racism is an issue 🤷 not really an excuse not to. People choose to ignore it. Poor people understand things are better for rich fucks, and they refuse to understand things are bad for poor people. The wall you face when propagandizing poor people is the facts, with rich people it's their own willful ignorance.
i grew up poor and i didn't realize people were richer than me because i never interacted with them. i just accepted life was bad and it was for everyone.
only until i got to college i understood that i had been seriously fucked for my entire childhood and how much better your life is made just by having money.