Nevertheless, 30,000 people went and demonstrated at that summit. I don't think every person who went to demonstrate intended to overturn the Harper government's policies. I believe we have a right to express our opinions. It's healthy to do that in a democracy; it's healthy for political opinions to be disseminated, even if they oppose government policies.
I don't see why we would need to think we were going to influence the G20's decisions. We're entitled to express our opinions without that.