Miranda Devine says that many of the problems in Sydney are a result of years of lax law enforcement against the Lebanese Muslim gangs. I disagree with this, though:

Rather than a problem of race, religion or multiculturalism, Sydney is suffering from a longstanding crime problem. It is a textbook case of how soft policing and lenient magistrates embolden successive waves of criminals, infecting other people who might otherwise have been law-abiding.

But that begs the question of why the policing was soft, and the magistrates lenient. Ultimately, I think it still comes back to a misplaced multiculturalism, and an unwillingness to crack down on religious minorities, even when they were breeding a culture of intolerance and criminality.