The reason that best explains Thomas Jefferson's purpose for repeating the phrase "He has" in the list of grievances in the Declaration of Independence is to emphasize all the wrongdoings done by the king.
To stop alienating the parliament political founders used this phrase to blame all the grievences on the king.
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As with any author's decision to use 1st person, her intention most likely -- in this story -- was to get her readers to go along for the ride into madness and cultivate a certain amount of sympathy for the narrator and her plight. The constant use of "I" puts readers in the narrator’s head and allows them to empathize with her.