Comparing is not the same as equating. Of course, almost everyone agrees that human slavery is a much greater evil than animal captivity, which is why one pract

Comparing is not the same as equating. Of course, almost everyone agrees that human slavery is a much greater evil than animal captivity, which is why one practice is universally outlawed while the other is found in just about every human society. That doesn't mean that comparisons between the two should be categorically dismissed; on the contrary, their value is in forcing us to think more deeply about our role in the moral universe.