You can only keep them honest if you know what they're up to, and what their intentions are.
The fact remains that there are NGOs engaging in political advocacy who are hiding among the well intended, not telling their doners that they tacitly help "insurgents", or promote transnational socialist political causes.
Some Afghans even started calling them the "Toyota Taliban." Much has also been written about them as travelling elitist parasites who do more harm than good. Even to the point of making otherwise ambitious people less competative.
And to think that they're worried about being targeted by opponents of the coalition if they operate in the same area as the U.S. lead coalition!