Compared to other G20 summits in the past the protests in Hamburg, Germany seem quite violent to me. There were similar occassions of violent protests, such as at the 27th G8 (2001) at Genua, at the 33rd G8 (2007) at Heiligendamm, Germany and at the 4th G20 (2010) in Toronto. But they are years apart, so protests of this extend are not a standard occasion.
I understand (as is stated here) that most of the protests concern global warming and capitalism. However, there are ominous statements from protesters like this one:
We are living in a democracy and the red zone is not a democracy. I'm sure we can't stop all these leaders from meeting but if we can stop them from getting their food or catering shortly we've achieved something.
Now that protests are as natural to such events as the diplomacy done there is quite clear.
But the violence (there are reports of Molotow cocktails, tear gas and so on) strikes me as uncommonly high given the circumstance that firstly, the summit takes place in Germany and secondly that this single (annual) meeting most probably will not change the course of the world forever.
My insights are mere, could therefore someone elaborate on the reasons that spark those rowdy protests?
(I feel like the answer to this question does not apply to Hamburg in particular, for example the quoted statement above was given by German student without obvious immigration background.)
I am asking primarily about actions of protesters.