Many campaigns put little focus on preventing outbreaks of violence or the sorts of actions that the public would generally classify as violent. Therefore, they are susceptible to random acts of violence or unsanctioned property destruction or screaming matches. When the image of a campaign is one likely to snap from peaceful to unpredictable skirmishes, such as someone throwing a soda can at a cop, it tends to disincentivize the average observer who might otherwise be open to joining the next action.
All the research suggests that numbers matter a great deal. Old tired theories such as the Che Guevara triggering notion--a violent action done at the right time can trigger the revolution--are generally ahistorical and unhelpful. Empirical research indicates that if just a small percentage of the population can participate in civil resistance on a sustained basis--roughly 3.5-4 percent--the campaign will succeed.
When violent flanks alienate far more than they attract, it is clear that the effective campaigns will do all possible to set themselves up to resist and even repel violent actors.
When some organizers, who often mean well, say that we shouldn't reject anyone who is "on our side" and "wants the same thing" no matter what they do to try to get it, the smart organizer will help them understand that a so-called "diversity of tactics" will diminish the movement, alienating the general populace, and render the campaign far less effective. When someone who is generally sympathetic to a campaign turns on their tv and sees pepperspray, instances of physical clash, and even rubber bullets, they are far less likely to come into the next one.
Indeed, every decision made by the campaign should be run through the filtering question, "How will this affect recruitment?" There may well be some circumstances that are more crucial than recruitment numbers, but that prioritization should be accepted by the organizers and at least considered in deliberative discussions.
The recommended components of preventing the harm inflicted by the actions of a violent flank:
· Decide on a strict nonviolence code of conduct.
· Form a peace team dedicated to nonviolently enforcing that nonviolent code.
· Publicize that each event will be nonviolent (family-friendly, peaceful).
· Announce that the peace team is there to remind everyone of the code of conduct.
· Liaise with media and law enforcement to reinforce the image of the campaign as absolutely nonviolent.
· If there are dedicated groups insisting on a diversity of tactics, meet with them. Negotiate, insisting on mutual respect as a baseline, and let them know you will not renounce them in general unless they come into your event and disrupt it, at which point you will indeed denounce them and let everyone know they are not part of the campaign. Let them know they are quite welcome to your events when they can abide by your code of conduct. Let them know they may riot on a different day or on the other side of town and you will make no comment, only reserving that for any time when they act out in your event. This works. What does not work are philosophical arguments, or even strategy arguments. Focus on mutual respect and clear boundaries with predictable outcomes.