It's not a matter of mistakes (which are inevitable) or the occasional bad officer (ditto).
It's the overarching vision they have of needing to maintain authority at all times, no matter if it does more harm than good.
The police violence at the G20 was not about 'mistakes', it was deploying a tried and tested strategy.
Certainly, we have a need for people who track down rapists and burglars and whatnot. That does not in any way balance out the brutality and repression they mete out as standard.
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