What is the primary reason Brutus believes Caesar should be killed?

Brutus's belief that Caesar should be killed is primarily tied to the concern that Caesar's ambition poses a significant danger to the Roman people. Brutus fears that if Caesar continues to rise in power, he may become a tyrant, undermining the freedoms and well-being of the citizens. His decision is rooted in the idea that eliminating Caesar preemptively protects the republic and its values by preventing the potential for future oppression. This perspective reflects Brutus's deep commitment to the welfare of Rome and the democratic principles he holds dear. In a broader sense, his motivations are driven by the desire to preserve the state and its institutions from any threat, including the threat posed by an ambitious leader.