Answer:
Mark Antony understands that Brutus killed Caesar to protect the republic, so he wants Brutus kept alive.
Step-by-step explanation:
In Shakespeare's "Julius Caesar", Antony approaches conspirators in a friendly way after they killed Caesar, shaking their hands. He has many reasons to do so, the first being saving his own life. Also, he wants to know the reasons why the conspirators killed Caesar, and then pretends to sympathize with Brutus's interests in protecting the republic.
But, actually, he is planning to turn the public against conspirators through the exhibition of Caesar's body, also planning to take revenge on them.