In the first paragraph, MLK addresses the clergyman's words concerning the timing of the movement being "unwise and untimely", stating that he didn't have to take the time to answer the clergyman's questions, but because he respects them, he will answer their letter.
King's goal in issuing his "letter from a Birmingham jail" was to address criticisms directed against him by individuals who unarguably should have known better. The teachings of Jesus, he repeated, provided for the nonviolent activities that were solely intended to correct injustices.
Answer:
It creates uncertainty because the audience cannot be sure if the ghost is actually present, or if Macbeth has simply gone mad.
The reason why I believe that the author Maya Angelou included this passage is because she wanted to explain to us her emotions about the connection she had.