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According to Macbeth, why can't he kill Banquo himself?
Macbeth is too afraid of Banquo's bravery and power.
They have too many common and powerful friends who would be upset if Macbeth killed Banquo.
Macbeth, despite these plans, still loves Banquo as a friend and cannot bear to do the deed himself.
There are too many reasons why, Macbeth claims, which the murderers would not understand.
Even though he is king, Macbeth does not have that kind of power to kill someone directly.