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.
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.