The theory that large segments of populations are manipulated through indoctrination holds little water, and serves to stem real revolutionary efforts to change the minds of people. Roderic Day makes the case in this essay I consider to be required reading for any self-respecting leftist that instead of brainwashing, propaganda instead works by providing a narrative that is easy to "go along with" as tacit benefactors of present systems. Propaganda does not need to hold under scrutiny to be effective, because it serves as justification, it "licenses" the populace to adopt stances that align with state interests.
Because these narratives are easy to go along with and stem cognitive dissonance, this means that we can convince others, primarily through focusing on positives in the primary and debunking negatives in the secondary. We can convince the proletariat of the benefits of adopting Socialist stances and subvert that way, rather than focusing on debunking atrocity propaganda which gets ignored due to a still-existing belief that the present is the best that is possible.