Gang interventions

Why have so many gang interventions failed? From the TED Talk that was watched this week, can the intervention used in Boston that cut youth violence down be applicable in other cities or is it unique to Boston? Would it be applicable to gangs and gangs that have older members? https://www.ted.com/talks/jeffrey_brown_how_we_cut_youth_violence_in_boston_by_79_percent?utm_campaign=tedspread--b&utm_medium=referral&utm_source=tedcomshare      

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