If I was in that nail salon and saw a person stealing someone else’s engagement ring, I will immediately stop the pickpocket. After making sure that the thief has not possess any dangerous weapon, I will slowly approach and ask him the reason for doing it. Meanwhile, I will signal the bystanders to seek help from police. I then give him advice and tell him the consequences of stealing. It is because everyone has no right to go shortcut in life. We need to pay our effort for the result. Next, I will ask him to apologize to the owner and motivate him to be an honest man.
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I believe that the best answer to this question would be a tragedy. However, there may be more than one genre that accomplishes this goal. A tragedy is, specifically, a form of drama. It, "treats in a serious and dignified style the sorrowful or terrible events encountered or caused by a heroic individual" (this is the definition given in Encyclopedia Britannica.) A tragedy most definitely depicts the flaws in human nature.