But the most effective critics of those kind of things are people from within the community where they occur - they know what they are talking about, whereas it is all too easy for outsiders to get things wrong and make things worse.

But then what of education? Should no outsiders be welcomed if they bring "outside" ideas of efficiencies, etc. which may upset the apple cart, so to speak?

I doubt the citizens of rural areas in Africa and elsewhere minded the the Outsider who must have had some critical viewpoints on their traditional ways of getting water when he invented the PLay Pump.

I know that's not quite what you meant, McGrath, but that was a blanket statement, imo. Sometimes effective critics do come from Outside.