In the case of Greece, we hafta look at their recent (well OK, 'recent' to me, age 58) history. It's not that long ago that the Colonel's in the military junta employed quite aggressive (the opposition says 'brutal') repression techniques on dissenters. As a result, the following democratic gov't institutionalized "safe haven" laws for uni's and churches - those campuses are no-go areas for police now - making them cauldrons of disaffection.
Good points made above re: police use of force and tactics. I assert tho', that those measures, while applicable to US/UK/W. Euro these days, are foreign to the folks in Athens who's memories are long. I predict the police there will just let the rampage die down of it's own accord, without much anti-riot interference, then just quietly compensate property owners who've been harmed.
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I liken it, somewhat, to the US period after May 1970's Kent State "massacre". That incident polarized the country even moreso than it had been. Within a few years, protests were attended by non-bayonetted, non-live-ammo, passive resistence police forces.
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