just a note australia actually has a higher rate of crime murders and car thefts per capita than the usa. So its not that unsual that its happening.
It sorta seems really random that they did it then turned themselves in. The young ones these days are getting into weird games now so for all we know it could have been a game gone wrong or something like that.

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I had the loudest stereo in a wrx in WA. Until i hit a wall.