"IOW, the MSF organization is only interested in making the "required motions" for emergency aid, not in doing all they can to help those people.
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Actually, I don't think that is the case. They have a limited number of doctors, etc. who can respond. Once they are fully budgeted for their response, they don't need further contributions. This sounds like an excellent way to operate. Other agencies may still be ramping up their response and would be better targets for donations. Why waste money?
If you don't, you run the risk of looking like the Red Cross following 9/11. Funneling the donations to fund touchy feely stuff not related to the original crisis/catastrophe that prompted the donation.
In this case, I applaude them. Gives them more credibility when asking for donations after the next event.