What the hot-heads have to understand is that you don't need violence to win, at least not in a democratic, regulated market economy. Companies do not make products that consumers ignore. No bad company practice can withstand the challenge of media expose, preventative laws or tax regimes, or shareholders dumping stock in protest. Witness Monsanto, or Shell, or many other examples. The initial challenge for campaigners is to get the right information to the right people in the right way at the right time.
Information is the first step to democratically exercising power.
The second is to act upon it effectively. The third step is to peacefully organise and mobilise that activism toward government and company decision-makers so that transformation occurs. Violence is grotesque, but even the limited democracy we have is borne of it. Parliament itself is a result of the violent struggles of the English civil war. There have been enough failed earth summits and abandoned parliamentary reforms.