Here are the primary reasons why they killed him:
1. Fear of Tyranny: Many senators feared that Caesar's growing power and ambition would lead to a monarchy, effectively ending the Roman Republic. Caesar's recent actions, like accepting a lifetime dictatorship, fueled these concerns.
2. Personal Rivalries: Some senators, like Brutus and Cassius, were personally opposed to Caesar. They believed he had become too powerful and was a threat to their own ambitions.
3. Political Ideals: The senators involved in the conspiracy believed they were acting to preserve the Republic. They saw themselves as patriots defending Roman values from Caesar's perceived tyranny.
4. Concerns about Caesar's Reforms: Some of Caesar's social reforms, like granting citizenship to Roman allies, were unpopular among certain groups of the Roman elite. They believed these reforms weakened the power of the Roman aristocracy.
5. The Power of Propaganda: The conspirators used propaganda to justify their actions, portraying Caesar as a tyrant who was threatening the Roman Republic. This propaganda helped to garner support for the assassination, even among those who were initially hesitant.
Important Note: The assassination of Caesar was a complex event with multiple contributing factors. It's not possible to attribute it solely to one reason. The combination of fear, personal rivalry, political ideals, and the use of propaganda all played a significant role in the senators' decision to kill Caesar.