Hello. You did not inform the speech to which this question refers, which makes it impossible for it to be answered accurately. However, I will try to help you in the best possible way.
If King was trying to be persuasive, lines 307 - 334 can only affect persuasiveness by reinforcing the argument King is making. This can be done through a clear and objective diction that reinforces the importance of King's words. In addition, these lines can create a logical, ethical or emotional structure for the speeches, proposing a greater connection between king and the public.
Tituba was the first one blamed for witchcraft because she was a slave, the lowest of the low, the bottom class, below even the poor and homeless. Not only did this make her an easy target of blame for the girls, but to make her situation worse, she had been known for having known voodoo from her home in Barbados. She had been the one to stir the pot, and to sing songs in her native tongue. It is for all these reasons that the blame of witchcraft was thrown at Tituba. I hope that this answer helped!
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