If anyone is interested in what may have led to this problem they might want to read this article.
Link This can happen in any country given the same circumstances.
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The state, while concerning itself with the details of their housing, their education, their medical care, and the payment of subsidies for them to do nothing, abrogates its responsibility completely in the one area in which the state’s responsibility is absolutely inalienable: law and order. In order to placate, or at least not to inflame, disaffected youth, the ministry of the interior has instructed the police to tread softly (that is to say, virtually not at all, except by occasional raiding parties when inaction is impossible) in the more than 800 zones sensibles—sensitive areas—that surround French cities and that are known collectively as la Zone.