It is both wrong:
To hurt people who use their right to protest agaist politics and to destroy or burn cars or hurt policemen.
There is always somebody who makes profit of the aggressiv situation.
I do not know how to get a just world without poor people in Germany and the rest of the world.
I do not know how to convince very rich and very poor people to keep the world clean and safe nature.
But I know for sure that there are people who protest for a better world and there are others who destroy things or hurt people just to have trouble. These ones cause the opposite and maybe they are payed for it.
And there are policemen who must do their job and do it as humans because they want to save other people and there are bad ones who want to use their power.
All of you! Think!