Whatever a "leftist hateblog" (!) might be, that description doesn't seem to be fitting here.
"Krawalltouristen" specifically is a term that came up for the first time, I think, with the G20 protests last year. Hooligans might not be the most accurate translation; it essentially means people who travel somewhere specifically to participate in riots/vandalism/looting under a political pretence.
If you know a more fitting description for a blog like this, please do comment.
Do you consider the New York Times a “hateblog” for their endorsement of political violence against the former government of Iraq?
No, that's war mongering/yellow journalism by a mass media company, far worse and more destructive than a "hate blog"
I don't know if somebody is going to say that this is edgy triple-layer sarcasm, but its pretty clear to me that at least some readers of the site will take this as an endorsement of potentially lethal violence against political opponents.
If you throw rocks at political opponents, you don't think they're just misguided and their policies unfortunate, you hate their guts.
EDIT: The paragraph is explicitly about breaking windows, and say to be careful not to risk hitting people. So it's not about violence against individual people, but it's still violence, and illegal. And you don't break people's windows if you merely disagree with them.
As for naming such Blogs, „Riot Travel Agency“ seems fitting... ;)
Leftist doesn't mean liberal, peaceful etc.
It means leaning to the left, afaik that usually means towards socialism and communism.
For those who are either old enough or have read enough history there are plenty of examples of left leaning haters.
See for example https://en.m.wikipedia.org/wiki/Red_Army_Faction
Edit: added quote from parent post.
I'd also like to point out that I'm not defending the police (or anyone else) just trying to correct a misunderstanding before it spreads even further.