Final answer:
In Shakespeare's 'Julius Caesar,' Brutus feared that Caesar would become a tyrant and threaten the republic and liberties of the Roman citizens, leading to his assassination.
Step-by-step explanation:
In Shakespeare's play Julius Caesar, Brutus argues that Caesar would have eventually become a tyrant to the people of Rome if allowed to live. He feared that Caesar's ambition would lead to the establishment of a monarchy, subjecting the people to his rule without their consent. As a senator and believer in the republican values of Rome, Brutus pondered that the assassination was a necessary evil to prevent Caesar from disrupting the republic and infringing on the liberties of its citizens.