Who oppose the idea of killing Mark Antony?

Opposition to the idea of killing Mark Antony primarily came from figures like Brutus and Cassius, who were concerned about the potential consequences of such an act. They feared that assassinating Antony could provoke a backlash or lead to further conflict within Rome. Additionally, there was a belief that Antony might be a useful ally against their common enemy, Octavian. The political dynamics and personal relationships played a significant role in their decision-making.