How is propaganda used to "sell" people on a viewpoint?

The indoctrination of children with propaganda by the Nazi party is most obvious in the character of Gretel. When we first meet her in Chapter Three, she is clearly a child, though a few years older than Bruno. She spends most of her time arranging her dolls and has brought the entire collection from Berlin with her. Significantly, she is the one who tells Bruno that the name of their new home is "Out-With." This misnaming of the specific location marks Gretel as a child at this point, in contrast to the teenager she will grow into by the end of the story. When Bruno points out how young she is in front of Lieutenant Kotler, she responds by snapping at him, "'I'll be thirteen in a couple of weeks' time. A teenager. Just like you'" (74). Her words to Lieutenant Kotler accomplish two things: first, they foreshadow her mental shift as she grows out of childhood; and second, they remind the reader that some of the Nazi soldiers committing horrible actions against the Jews in the concentration camps were indoctrinated teenagers. Finally, Gretel replaces her collection of dolls with maps of Europe given to her by Father, which she updates using the newspapers each day as she reads about developments in the war. Her transition out of childhood naivete is represented clearly in her correction of Bruno's usage of "Out-With" in place for "Auschwitz." It was she who first told him the name of the place, but now she corrects him. Her understanding of the situation is still simplistic and lacks understanding: she has accepted what her Father and Herr Liszt have taught her without much critical thinking.