How does this justify the murder of an innocent life?
Of course the fact that some animals, even ones as advanced as fishes, don't appear to feel pain either doesn't stop the same utilitarians from use the pleasure/pain argument when arguing in favor of animal rights. But then again, logical inconsitency is the stock in trade of Peter Singer types.
Exactly. Taking the word "torturous" out of the phrase "torturous murder of a small child" doesn't really change much, does it?