The feud between the Montagues and the Capulets is the cause of Romeo and Juliet's deaths, and probably their romance as well. If there were no feud, the two families would have moved in the same circles, and Romeo and Juliet would have known each other all their lives.
Brutus' tragic flaw of idealism contributes to his downfall because he was gullible enough to be convinced by Cassius and Antony that they were going to murder Julius Caesar for Rome's development and goodwill. He was blinded by that idealism and believed that these were their true intentions for inviting him in the murder, thus, making him involved greatly and made him feel guilty - leading him to suicide.
R: Restate the question
A: Answer the question
C: Cite evidence
E: Explain