I don’t call the happiness itself “slight,” I call it “slightly more” than the suffering (edit: and also just slightly more than the happiness per person in world A). I acknowledge the happiness is tremendous. But it comes along with just barely less tremendous suffering. If that’s not morally compelling to you, fine, but really the point is that there appears (to me at least) to be quite a strong moral distinction between 1,000,001 happiness minus 1,000,000 suffering, and 1 happiness.
I don’t call the happiness itself “slight,” I call it “slightly more” than the suffering (edit: and also just slightly more than the happiness per person in world A). I acknowledge the happiness is tremendous. But it comes along with just barely less tremendous suffering. If that’s not morally compelling to you, fine, but really the point is that there appears (to me at least) to be quite a strong moral distinction between 1,000,001 happiness minus 1,000,000 suffering, and 1 happiness.