Seems the main suspect didn't come from a "deprived suburb"—at least according to the latest update by lemonde. Typical reflexive, prejudice pattern thinking.
"Il habite « le centre » de Romans-sur-Isère, et « non le quartier de la Monnaie », a précisé le procureur de Valence" from https://www.lemonde.fr/societe/article/2023/11/21/apres-la-mort-d-un-adolescent-de-16-ans-a-crepol-sept-personnes-interpellees-annonce-gerald-darmanin_6201515_3224.html