It's said that if you are feeling down and you want to see a movie you should not go see the feel good movie but the sad sappy one where everything goes wrong. The reason being that people cannot help but compare their life and situation to others. If you were to see the 'feel good' film you would compare all the negative things in your life to all of the good things in the life of the characters. However if you go to the ore depressing film you are more likely to come out and think "Well at least my situation is not as bad as that one."
Tragedy is meant to make the viewer feel pity and fear for the character of which the event is happening too. The overall goal of a tragedy is catharsis—"the purification or purgation of the emotions aroused in a tragic performance."( Tragedy, Wikipedia). What defines a piece as tragedy is mostly depending on the audience's opinion . if the audience dose not feel a senses of pity, fear or catharsis them then it might have been meant to be a tragedy but it is not.
The tragedy is more heart wrenching because the person puts themselves' in the circumstances that lead to the tragedy when they could have prevented it but chooses not to or is unable to see their own flaws that led to the tragedy. "if a character’s downfall is brought about by an external cause, Aristotle describes this as a misadventure and not a tragedy. " ( Tragedy, Wikipedia)
In Revenge tragedy the started to become popular in the Elizabethan era the characters would lead to there own demise in the seek of revenge and self justice.Writers of this time were using tragedy ,which the common people who experience much hardship enjoyed, to display how the government was not providing the common people juries. The Elizabethan houses incorporated ideas from the roman version of tragedy into their writing. "Revenge tragedy stems from”Roman Tragedies, in particular, Seneca's Thyestes. Seneca's tragedies followed three main themes: the inconsistency of fortune (Troades), stories of crime and the evils of murder (Thyestes), and plays in which poverty, chastity and simplicity are celebrated (Hippolytus).”