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.
what if you're not curious enough to ask those kind of questions? what if you just accept that life is garbage? because that's a reasonable viewpoint to have, it's valid.