A la Mad Max:
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Or we could do like in the States where law enforcement gets surplus military equipment. Then again, by the time the CAF is done with something I'm not sure they'd want it.
What they really need is for the chain of command, civilian oversight and politicians to back them when things go sideways, and they will. The "they" is the individual members. Senior command may not get their contract renewed or, even more rare, get their wrist slapped (it happened to a TPS commander after G8/G20), but it is the individual coppers who often end up in the dock.
A contested arrest, let alone a protest confrontation, is messy, and with social and traditional media, is there for all to see. Despite the training, most cops aren't ninja warriors and its not scripted like on TV. Any action taken in the 'heat of battle' will be parsed both formally and informally. At the macro level, law enforcement should always be aware of this, since they can lose the legitimacy of the public if it seen as too heavy handed. Quite frankly, if they thought about it, the so-called organizers should be worried as well. They don't really control much of what is going on, and all it takes is for some lunatic to do something really stupid and any public support they have will evaporate.