The Poem the Expression of the Poet's Emotion?

Is his or her poem the expression of the emotion or disappointment of the poet on the subject?
When an investigative journalist writes about a politician's unexplained wealth is he attacking the person?
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Roman Jacobson, Modern Russian Poetry:
To incriminate the poet with ideas and feelings is just as absurd as the behavior of the medieval public that beat up the actor who played Judas.