I think a good movie is a story told well, and the thoughts that want to be expressed are just expressed by the story. A good story, a good idea, is a good movie.
Regarding the film itself, the thought I see is that it is not simply criticizing East Germany (socialism) and praising West Germany (capitalism). Making different choices for the future is equivalent to an experiment. In the end, choose the good side, and keep the bad side as a lesson. There is no right or wrong here. Faced with reality, this is a rational country, and a country with such a rationality must have equivalent high-quality citizens.
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