A logic which applies only to people who are interested in getting a warm glow and not for people interested in helping. Diversifying charitable investments maximizes your chance of getting at least some warm glow from "having helped". It does not help people as best they can be helped.

I'm beginning to think that LW needs some better mechanism for dealing with the phenomenon of commenters who are polite, repetitive, immune to all correction, and consistently wrong about everything. I know people don't like it when I say this sort of thing, but seriously, people like that can lower the perceived quality of a whole website.