The point of the film is:
Logical reasoning based on incomplete objective physical evidence may not necessarily reveal the truth;
Starting from incomplete objective evidence, carrying out logical reasoning can mislead the illusion and realize a perfect crime;
Logical reasoning cannot reveal the changing rules of human emotions.
In conclusion, it is very pale to expect to use logical reasoning to reveal the final rules of all things in nature. (Here comes the divine power like God, but all phenomena that cannot be explained by logical reasoning are attributed to divine power. This is why mathematicians, especially physicists, resort to philosophy and fall into theology when they encounter a bottleneck )
It is the same principle as "The Vortex of Truth".
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