Actually, it's pretty easy to find pictures of people just like this all over the internet - protesting capitalism, "American Imperilism", etc. These examples of lunacy happen pretty frequently in cities like SF.
This one was particularily interesting because they happened to hit a cop in the head and land him in the hospital in serious condition as part of riots in San Francisco RE: the G8 meetings in Scotland.
With regards to the dirtbags who nailed that cop, I am superior. I imagine everyone on this board is.