> Rupert Scofield, who runs FINCA, one of the largest and most prominent microlenders, said randomized controlled trials work well in medicine but don’t make sense in evaluating development aid. He said that for years, his response to claims like Duflo’s was to say he didn’t need data when he could see the effect firsthand.

It sounds like he is suffering cognitive dissonance. He believes in RCTs and he believes in microlending. To resolve the conflict, he rationalizes first that RCTs "don't make sense" in the microlending world. Next he decides that researchers themselves aren't credible as good researchers would not reach a "false" conclusion.