See the matter of the pie. Xannon’s proposal is identical to the Super Happies’; meta-ethical “fairness”. Regardless of how you might feel about a Super Happy future, the Suffering Rapists hated it. Rational agents will choose the option which maximizes expected utility, accepting the deal didn’t maximise expected utility, so the deal was rejected. That’s all there is to it.
See the matter of the pie. Xannon’s proposal is identical to the Super Happies’; meta-ethical “fairness”. Regardless of how you might feel about a Super Happy future, the Suffering Rapists hated it. Rational agents will choose the option which maximizes expected utility, accepting the deal didn’t maximise expected utility, so the deal was rejected. That’s all there is to it.