What movies describe the darkness of human nature?

Below I recommend several movies with similar plots.

The drama Seven Deaths and Lives is full of gluttony, greed, lust, laziness, pride, jealousy and revenge, which has the warning significance of religious and moral advice. After careful analysis, the seven punishments suffered by the killer seem to follow the rules: he doesn't kill directly. Fat people are forced to eat too much and burst blood vessels and die; Lawyers cut off their own meat-only 1 pound, neither more nor less; The drug dealer was still alive when he was found; Prostitutes are directly killed by clients; The model only had her nose cut off, and she was too proud to call the police, so she bled to death. The murderer claimed to have committed the crime of "jealousy", but jealousy itself does not constitute a crime. Only when he killed the innocent Tracy did he become the target of Mills' angry revenge.

The melting pot, adapted from a real event, was exposed in 2005 and still has no happy ending. Therefore, the perspective and significance of this drama have probably deviated from the original intention of appreciating film and television dramas, and there is no distinction between good and bad. Supporting movies is more or less a hope and attitude of pursuing justice. In a word, the distinctive features of this film are probably only applicable to this drama, and the so-called "going too far is too late", but director Huang Donghe used this risky move to pour his grief and indignation into the melting pot.

The success of Donkey Water lies in irony, and its part lies in exploring the bottom line of human nature. In the film, the headmaster encountered economic difficulties in pursuing the ideal of educational development. So, under the code word of "the overall situation is the most important, and the details can be released", he declared the nonexistent "donkey water" teacher quota to the Ministry of Education in the name of special water transportation for water-deficient schools, and received an extra salary every month. It was originally intended to be built, but it was misappropriated by the principal and teachers. In this film, the complexity of human nature is vividly displayed. President sun wants everyone to educate for the sake of education, but he has fabricated one lie after another, which is irreparable. He created a prop with Confucian education, which is really ridiculous and sad.

These are the films that I think are worth recommending to describe the darkness of human nature.