I understand the spelling lesson, but not your German.
You put forth the notion that if something seen in a fictional creation like a film "rang true" to a viewer, then it must have a "kernel of truth". I presented a number of films which put forth notions which very probably "rang true" to a large segment of their audience at the time they were shown. The idea was to cast doubt on your rather silly assertion. They were films produced in Nazi Germany that were very popular in that country:
Der Ewige Jude
"The Eternal Jew" (1940) - The Jews of Poland (invaded by Germany in 1939) are depicted as filthy, evil, corrupt, and intent on world domination. Street scenes are shown prejudicially, along with clips from Jewish cinema of the day and photos of Jewish celebrities, while the narrator "explains" the Jewish problem. The climax and resolution of the film is Hitler's 1939 announcement that the Jewish race will meet its "annihilation" (Vernichtung).
- "The Jew Süss" (1940) a historical costume melodrama - a conniving, ambitious Jewish businessman, Süss Oppenheimer, snares a post as treasurer to the Duke of Wurttemburg by showering the corrupt duke with treasure and promises of even greater riches. As the Jew's schemes grow more elaborate and his actions more brazen, the dukedom nearly erupts into civil war. Persuaded by the Jew, the Duke all but scuttles the constitution and alienates the assembly by lifting the local ban on Jews in Stuttgart. In a final outrage, the Jew rapes a wholesome German girl and tortures her father and fiancée. When the Duke succumbs to a sudden heart attack, the assembly of Elders try the Jew and sentence him to death for having "carnal knowledge of a Christian woman".
Leinen aus Irland
"Linen From Ireland" (1939) shows how Jewish textile company owners are sabotaging the German linen industry by buying linen from Ireland instead of having it produced in "the Fatherland". In Bavaria in 1909 a Jewish employee of a textile company begins importing cheaper linen from Ireland, sabotaging local production and threatening many of the workers with unemployment. Eventually his scheme is exposed.
"Our Flags Lead Us Forward" (1933) - the story of Heini, a small and not very strong blond boy. His parents live in a poor area of Berlin. His mother is portrayed as a caring and kind woman. His unemployed father, a socialist, is a bitter and unpleasant man. Heini’s father sends him on a weekend’s camp with young communists. During this weekend, Heini meets a group of Hitler Youth and decides he would like to join them. His father reacts violently to this. The Hitler Youth nickname him ‘Quex’ (Mercury) because he volunteers for the most hazardous missions that the Hitler Youth carries out. While distributing Nazi leaflets he is attacked by communist thugs and fatally injured. His last words are the words of a Nazi marching song: “We march for Hitler, through night and dread – the flag means more than being dead.”
Theresienstadt: der Führer schenkt den Juden eine Stadt
"The Fuehrer gives the Jews a City" (1944) A film showing how the kind Adolf Hitler has "given" the Jews a city of their own (Theresenstadt, actually a concentration camp). Shows happy smiling well-fed Jews in comfortable homes.
Maybe a more up-to-date example of a film with a "grain of truth" might be Borat?