But you devote a great deal of your book to covering the issues surrounding slavery. Slavery is different. It can be fruitfully discussed. Slavery creates a relationship in which one party abuses its power. In nineteenth century America, it was whites over African-Americans, but there have been many kinds of slaves between Pharaoh and Jefferson Davis.
Society now agrees that a person of color has as much right to liberty as a white person.
It was wrong to enslave humans 300 years ago or 3000 years ago. It is wrong today to enslave bonobos and chimpanzees. Regardless of whether we're speaking about human slaves or nonhuman animals, we're talking about beings deprived of their abilities to live complex lives. Slavery in England crumbled largely as a result of legal scrutiny. The rulings that judges handed down that rooted out English slavery are transferable to the rooting out of nonhuman animal slavery.