https://phys.org/news/2018-05-neighbourhoods-dangerous-local-strengths-lifeline.html

Australian cities aren't immune to the dangers. While there is no clear upward trend in crime nationally, the social polarisation and concentration of certain crimes in parts of the cities of Sydney and Melbourne are cause for concern. As a result, New South Wales and Victoria are the states with the highest rates of unlawful entry and armed robbery.

Sydney in particular is experiencing a "ghettoisation effect". Social polarisation between suburbs is increasing. Another issue in Sydney's western suburbs is domestic violence.