Imagine living in a place where the is literally no chance of the police helping you out or successfully prosecuting crime. Indeed, imagine living in place where the police often actively work against justice. Imagine living in a country where there is no value to life and everyone has a family member who has been murdered and there is no chance whatsoever of a prosecution because, likely, the person who murdered your loved one is part of a society-wide general corruption of civil institutions.
Just for a small taste of how things are: http://www.newrepublic.com/article/113293/900-bus-drivers-de...
So please, spare me your moralizing when it comes to people who turn to self-policing neighborhoods just so they can try and bring a semblance of stability to their lives.