Brutus's strength is also his weakness. He tells the truth and assumes others will also. He is naive. He cannot see through Antony's deceit. He assumes that Antony bears them no ill will because he says he does not.
Brutus is a decent man, but he is also arrogant in that he thinks he can control the situation by thinking his way through it. His sense of decency leads him to let Antony speak at Caesar's funeral, but his arrogance makes him believe that the conditions he sets forth for Antony's speech will insure that Antony does not say or do anything to turn the people of Rome against the conspirators. This proves to be a fatal mistake.
Brutus tries always to do what he thinks is right, but he is not in touch with many of the realities of human nature. He is ultimately destroyed by his own idealism.
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