Ummmm...why not? Is he volunteering to share the material lifestyle of the average African to help redress the injustice?
I would invite Mr. Blackwalter to come with me to Ban Rong Kart in Southeast Asia next month to explain his reasoning. Now I have seen Christian missionaries there dealing with health issues and I have seen Americans and Europeans helping with the irrigation system and to make the water supply healthy (using clorine of all things), but I have never seen any environmentalist trying to help.