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Does anyone know why Singer hasn't changed his views on infanticide and killing animals after he had become a hedonist utilitarian? As far as I know, his former views were based on the following:
a. Creation and fulfilment of new preferences is morally neutral.
b. Thwarting existing preferences is morally bad.
c. Persons have preferences about their future.
d. Non-persons don't have a sense of the future, they don't have preferences about their future either. They live in the moment.
e. Killing persons thwarts their preferences about the future.
f. Killing non-persons doesn't thwart such preferences.
g. Therefore killing a person can't be compensated by creating a new person. Whereas when you kill a non-person, you don't thwart many preferences anyway so killing non-persons can be compensated.
I think after he had become a hedonist this person/non-person asymmetry should mostly disappear. But I haven't seen him updating Animal Liberation or other books. Why is that?
I think he writes a bit about it here: https://petersinger.info/faq in the section: "You have been quoted as saying: "Killing a defective infant is not morally equivalent to killing a person. Sometimes it is not wrong at all." Is that quote accurate?"