I do appreciate the question, but I would concur with the speaker ahead of me that our current criminal laws are very adequate to protect us from the kind of behaviour of people who would come and wantonly set fire to things, or take over a demonstration, or otherwise become violent and dangerous to the population. As a person who does attend some of these demonstrations, I certainly don't want to be around that.
I think he made the very good point that this is extremely well covered by our Criminal Code already, and I know many people who have seen this happen and have seen this kind of delineation between the two things.