Cassius wants to kill Antony as well as Ceaser. what arguments does Brutus use to persuade the others that Antony should not be killed?

Brutus argues that they only set out to kill Caesar. He says they are not butchers and should avoid killing others without just cause.

Our plan will seem too bloody, Caius Cassius,
To cut off the head, and then hack off the arms and legs,
Like anger in death and jealousy afterwards,
Because Antony is but a limb of Caesar.
Let’s be sacrificers, but not butchers.