[ZenGum]

The Greek riots were an expression of deep political anger; the police shooting was just the spark that ignitied it. Australia lacks that anger, so the spark did not ignite.

The Victorian Police (whose badge consists of an inverted pentacle and the motto "uphold the right", btw) have different gun-handling rules to most Australian states. 10 or 15 years ago two officers were shot and killed in a deliberate trap, and the police got the FBI to assess their procedures, and the Victorian police adopted the shoot-to-kill procedure, i.e. if you need to start shooting, continue shooting until the situation has been resolved.
In South Australia they use minimal shots. Recently a chap aimed a (replica) gun at police and one of the four officers present fired one shot (which was fatal). There was a case a few years ago when the specialist snipers did actually shoot the gun out of someone's hand with a single shot.
That kid was a perfect case for a taser.