I'd say poverty, poor education, as well as poor enforcement of gun laws due to neutered law enforcement agencies are bigger causes than gangs since gangs would lose a lot of members with these measures.
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www.foxnews.com/politics/2014/03/26/california-state-senator-arrested-in-fbi-sweep/ http://www.sfgate.com/crime/article/FBI-conducting-raids-in-San-Francisco-5350602.php http://www.cbsnews.com/news/california-state-senator-leland-yee-arrested-in-federal-raid/ http://abclocal.go.com/kgo/story?id=9480515
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I'm not stupid enough to think they're not corrupt but simultaneously they're the only group big enough to make a significant difference. They don't however since they're extremely inept.
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or they're so corrupt that they're profiteering behind the scenes.