AULNAY-SOUS-BOIS, France (Reuters) - With every night that France's rundown suburbs burn, officials grow increasingly convinced that drug traffickers and Islamist militants are using frustrated youths to challenge law and order here. ADVERTISEMENT Many people who watch their cars, shops and schools go up in flames, however, are not buying it. They blame unemployment, racial prejudice and widespread youth boredom for the outbursts. Finding "hidden hands" behind the unrest seems like trying to catch the rioters as they rampage through the night. Some may get caught, but far more slip away in the darkness. "Everybody is fed up seeing our...