I'm going to have to ask you to clarify you on what you mean by this. Are you referring to the organisers, the rioters or the police?
Protesters.
I'm going to have to disagree with you on that point, and disagree strongly. The rioting on wednesday was absolutely despicable. If someone feels strongly about an issue, then they are doing only harm by acting like that. Even if you disagree with governmental policies, two wrongs do not make a right.
If you're referring to the non-violent protesters, then they are still not entirely blameless. If you saw someone breaking into your neighbour's house, it would not be right to stand around and do nothing. The non-violent protestors there, even if they did not actively do anything, still allowed such things to happen and their presence impeded the police from being able to do their jobs.
That's really not fair. Once a mob get angry, there is nothing that peaceful protestors can do about it.
Leave. It's that simple. The presence of a large crowd of people gives the more violent people a way to hide in the crowd. I know several people, who although they weren't taking part in any violence, still were part of the crowd there for over an hour and a half. I saw many people emerging from the crowd, doing something violent, then slipping back into the crowd before they attracted too much police attention. If there is no crowd of people, then they will not be able to do that.
Throwing fire extinguishers off of roofs is clearly mindless and a very stupid thing to do, but doing a bit of damage to a parties headquarters is a different matter altogether. it's all insured and I'm very happy for the big banks and insurance companies to lose as much money as possible.
Why should these people suffer for something that is completely beyond their control? Why do you hate large companies so much? I'm sure that you would not want local corner shop to be smashed up, so what differentiates them from these large companies?
Basically you seem to be suggesting that people should not protest at all, please correct me if my assumption is wrong.
I'm not saying that people should not protest, I'm saying that people should know when to stop protesting.