Of course what those riot troops do is not right, but its somewhat understandable
people throw bricks at you, fire bombs, whatever they can find that might harm you
and in the beginning you basically have to take the beating, until you get the order to "engage"
and if you get the chance to let off some steam, in this case a guy laying on the ground being beaten half unconscious, then you might just snap and give him another few beatings
in the end of the day we are all human, whether we wear a balaclava and black clothes, or a riot-squad outfit - everybody can only take so much before they snap
who knows what this riot squad in the video has been through that night already
that doesnt justify what they do, but at least i can understand it to some extent.
however the overall "im with the police, you are scum" attitude that leshma kind of described is definitely shit, a proper law enforcement, which actual rules that are being followed etc, is a foundation for a happy society
if people feel opressed, they are more likely to raise their fists, sadly corruption occures more and more often, in fact im not even surprised hearing it everyday