The author's argument is basically that there's nothing wrong with cruelty to animals because I don't think it's wrong, and it's wrong to abuse babies, the elderly, the disabled because I think it's wrong. I'm not an extreme animal protectionist, I'm not even a vegetarian, but I simply can't accept the author's illogical argument.
According to the author, a person is wrong to abuse animals because the abuse reflects his bad character, and this reaction occurs, because there is the connection between the empathy for animals and the empathy for people in this person's culture, and this person accepts the connection (in other words, the connection is accidental, empirical, and can be removed). The authors also argue that when a person sympathizes with animals, it consumes the attention he needs to sympathize with humans. Since only humans have a moral status, the duty to empathize with humans trumps empathy for animals. Based on the premise above, we can conclude that responsible contractualists should constantly and publicly abuse animals, let all humans get used to this abuse and let all humans eliminate that empathy connection, so that humans can devote all their attention to empathy for humans .
The author certainly did not draw this conclusion (perhaps without thinking carefully about his own illogical views), because it would make his theory completely contradict common-sense beliefs and fail to achieve a the Reflective equilibrium.
What's even more ridiculous is the author's astonishing belief that the basis for feeling pain is being aware of one's own experience of pain, as if I wouldn't feel pain without thinking about the circumstances of my injury. Of course, the author himself realized his stupidity and corrected his point of view in a later paper (SUFFERING WITHOUT SUBJECTIVITY). It's a pity that the author doesn't realize that almost all the ideas in his book are ridiculous.
It's a pity I can't give this book minus five stars.