Why is it bad rhetoric to insult one's opponent instead of responding to a valid point

Which sentence from the article best supports the statement above

Which statement best describes how the first-person narration in fever 1793 engages readers? mattie's perspective on the city of philadelphia gives readers an understanding of why some residents are leaving for the country. mattie's perspective on the state of her family's business gives readers an understanding of the responsibility she feels. mattie's perspective on her grandfather's strong-headed opinions gives readers an understanding of the influence he has on her. mattie's perspective on the events of 1793 gives readers an understanding of the experiences and uneasiness of the time.

In the myth of demeter persephone and hades what happens when demeter learns that her daughter has been kidnapped