Because he mocked in private and celebrated Wemba’s arrestation that made them furious.(Hencce why Wemba said in the Somo Trop-generique “Boyebisa yuma wana alongola kombo na nga na vie naye”) It made people immediatly suspect him about having snitched Wemba to police, while he had nothing to do with that. (The police started to do some research, because they found that amount of people which went to Paris for his Bercy-event strange).