You’re assuming consistent preferences over the whole relevant set of (A,B)s, which violates things like sacred-unsacred value tradeoff taboos. You’re further assuming continuity of preference levels, which… is probably true with a bit of interpolation. You’re also assuming that the amount to divide between charities is fixed.
Overall I’m not sure this convinces anyone who previously wasn’t.
You’re assuming consistent preferences over the whole relevant set of (A,B)s, which violates things like sacred-unsacred value tradeoff taboos. You’re further assuming continuity of preference levels, which… is probably true with a bit of interpolation. You’re also assuming that the amount to divide between charities is fixed.
Overall I’m not sure this convinces anyone who previously wasn’t.