Are you commenting on the psychology of crowds, policing, political demonstrations, the psychology of packs…. Can't see what you're aiming at here. The title urges people not to focus on individual behaviour without giving much example of it. You give lots of examples re group behaviour but that is not the same.
***
You may find this comment from the French police (CRS) who handled the recent Strasbourg riots interesting: "Why do they (the Met) not use tear gas?" "They just use baton charges and kettling techniques." "No wonder that guy died then."

For crowd control, the Europeans prefer a heady mixture of tear gas, concussion grenades and rubber bullets. The French are particularly keen on gas. The Germans have their own dispersal tactics but are not shy to use water cannons. Et cetera.
***
As for the first sentence in your final paragraph…that's already happened Daniel. And has been for some time. You seem to be taking a rather wet stance on one of the real issues brought out by the G20 protests — that of the flagrant abuse of power by the City and Metropolitan police against citizens exercising their democratic right to protest.