The author gives an example of the adjectives in "The Giving Tree" and shows how the adjectives are limited and very simple and basic words.

The author pulls up other reviews on "The Giving Tree" which help support her argument here. The support from other readers makes it more likely that other people will support her argument as well.

The author is attacking Silverstein here by criticizing his book and saying that anyone who tries to defend it or say that is has a good moral to it wrong. The author uses a harsh, critical tone which makes the paragraph more of an attack.

The author describes the book here. The critical tone and the description of the book would make the reader uninterested in reading the novel.