I think you just see what you want to see. It has nothing to do with whiteness. Most of the main "white" characters on the show are negative characters. Tell me who are the main white characters? The Pellegrini family? That's an Italian name, not French. And they are the antagonists. You can as well argue that the show doesn't have any positive white characters, except for the lady journalist you disparage.

The people who developed the idea for the show were Jalil Lespert and Abdel Raouf Dafri, both of Algerian descent. Out of the two creators, Francois Uzan, is if you Google him far from a stereotypical white person. From the name I would guess he is Tunisian Jewish. The main director is a Chilean woman of Palestinian descent. Out of the 3 good cops (the captain of the police is white and corrupt), 2 are Algerian. Also at the police station, for 2 episodes there is quite a prominent role for Moussa Sylla, who plays a policeman and is black. Even in the prison scenes, except for the opening shot where he walks in, most of the characters there are either white or North African. The cast is incredibly diverse.