Lethal action is to be taken when it's the last recourse or as defense. I think the policeman should have shouted something like "drop your gun" before shooting, even if it's just allowing the thief to do so for a fraction of a second, and certainly not shoot twice if the first bullet hit. I can understand the cop's action in the heat of the moment but if he had thought this through that's what he should have done.
In the case of defending property, it often
is the last available recourse, before expensive (or irreparable) damage is done. At any rate, in this case both property and lives were at stake, so I feel it would have been far too risky to give the thief a chance to either raise his weapon, or attempt to drive off.
e: Scratch that, he actually pointed his weapon at the officer. There's no debate at that point - he needs to be shot.
So how's this trip to Tiananmen going ? "people" is much too vague, as only those actually lighting cars, pillaging and doing damage should be arrested. The best riot polices in the world are capable of isolating violent groups among peaceful protesters so I don't see why it is necessary to blindly go for global violent suppression.
I was referring to the individuals visibly causing damage. In the case of the Vancouver riots, most people in the mob weren't actually doing anything damaging. You don't even need multiple people shooting - a single guy can fire a shot or two into one of the vandals, which I imagine would be enough to (at least temporarily) dissuade any nearby, unwounded vandals.
Care would have to be given to make sure that the bulk of the mob is distant enough to prevent people from panicking and trampling one-another, and to ensure that the shooter is suitably trained such that innocents won't eat stray bullets or ricochets. If the latter isn't possible, then less-lethal weapons could be used (although, in the case of teargas, I would imagine the chance of causing a stampede would be even greater than with bullets).
The best riot polices in the world are capable of isolating violent groups among peaceful protesters so I don't see why it is necessary to blindly go for global violent suppression.
The police were unable to prevent a great deal of property damage during the riots, so I assume they felt that it would be far too risky to attempt to move in and arrest vandals. Even with the limited measures they took, there were still nine officers injured.