Al-Qa`idah has new fans in Washington, DC

"Aaron Zelin, a fellow at the Washington Institute for Near East Policy who researches Islamic militants, said the main reason groups such as Jabhat al-Nusra and Ahrar al-Sham have become popular is because of the social provisions they supply. "They are fair arbiters and not corrupt.""  How did this dude judge the fairness and non-corruption of the groups?