---Diamond---

Summary
Thorough whole parts of this text, Diamond tries to criticize the ambiguous thought toward race. He first denies the usual view toward race as "subjective." According to him, using this view, different elements or features make different classification of race. He expresses this situation as "the result of classification is not concordant." He   also points out  "hierarchy" of race. He criticizes that "hierarchy" is not useful because it is so vague in "race." Moreover, he shows the ideas of natural selection, sexual selection, no known function. In those, he recommends sexual selection. In conclusion, he states "snap judgment", quick and arbitrary judgment as dangerous action in modern world.

Reaction
Diamond seems to criticize a lot, but seldom suggests his own opinions. Indeed, at first look, his comments toward usual view are persuasive, but he does not state about sources he uses so much. This makes his text less persuasive. Moreover, his idea, sexual selection seems to be too subjective idea to me. How beautiful someone is can be changed depending on who, when, and how see them. If he wants to state that idea is useful, he should explain more.