I think this argument doesn’t quite go through as stated, because AMF doesn’t have an infinite funding gap. If everybody on Earth (or even, say, 10% of the richest 10% of people) acted on the version of contractualism that mandated donating significantly to AMF as a way to discharge their moral obligations, we’ll be well-past the point where anybody who wants and needs a bednet can have one.
That said, I think a slightly revised version of your argument can still work. In a contractualist world, people should be willing to give almost unlimited resources to a single identifiable victim than working on large-scale moral issues, or having fun.
I think this argument doesn’t quite go through as stated, because AMF doesn’t have an infinite funding gap. If everybody on Earth (or even, say, 10% of the richest 10% of people) acted on the version of contractualism that mandated donating significantly to AMF as a way to discharge their moral obligations, we’ll be well-past the point where anybody who wants and needs a bednet can have one.
That said, I think a slightly revised version of your argument can still work. In a contractualist world, people should be willing to give almost unlimited resources to a single identifiable victim than working on large-scale moral issues, or having fun.