Sticking with the cow example, I agree with you that if we removed their pain at being separated while leaving the desire to be together intact, this seems like a Pareto improvement over not removing their pain.
A preferentist would insist here that the removal of pain is not what makes that situation better, but rather that pain is (probably) dis-prefered by the cows, so removing it gives them something they want.
But the negative hedonist (pain is bad, pleasure is neutral) is stuck with saying that the “drugged into happiness” image is as good as the “cows happily reunited” image. A preferentist by contrast can (I think intuitively) assert that reuniting the cows is better than just removing their pain, because reunification fulfills (1) the cows desire to be free of pain and (2) their desire to be together.
I think my above reply missed the mark here.
Sticking with the cow example, I agree with you that if we removed their pain at being separated while leaving the desire to be together intact, this seems like a Pareto improvement over not removing their pain.
A preferentist would insist here that the removal of pain is not what makes that situation better, but rather that pain is (probably) dis-prefered by the cows, so removing it gives them something they want.
But the negative hedonist (pain is bad, pleasure is neutral) is stuck with saying that the “drugged into happiness” image is as good as the “cows happily reunited” image. A preferentist by contrast can (I think intuitively) assert that reuniting the cows is better than just removing their pain, because reunification fulfills (1) the cows desire to be free of pain and (2) their desire to be together.