It's well known to my fellow neocons and wingnuts that the left is more likely to attack places where the authorities act with self restraint (e.g., Israel instead of Syria). Is the Toronto protest/riot an exaggerated example? It seems to be nastier than similar nonsense in the United States or Britain. That might be due to the assumption that the Canadians won't react at all.
I also noticed the two main complaints on the left are: 1) The police are taking our cameras away! 2) They're installing surveillance cameras! Is the left for or against cameras? (For the record, I applaud both types of camera.)
Advice for those protesters who really are peaceful: Remember Law 1b.