Yes, it's puzzling.
70% of French criminals are of Arab origin. Maybe Arabs are better behaved in the Arab world than they are in France?
http://www.telegraph.co.uk/news/worldnews/europe/france/1135...
Maybe it's because the French are really soft on prisoners. That Coulibaly guy was furious they confiscated his playstation. I doubt Morocco or Algeria would have ever allowed him one..