If a group sponsoring an action wants it to have a certain tone, it is responsible to plan for what happens if some who show up don't go along. Not to plan for this is to abdicate responsibility for the action, and to risk becoming swept helplessly away with the manipulations of a few. In the heat or an action, emotions flow differently than in planning meetings. Therefore the planning meetings should take this into account, and figure out how to deal with emotions that may in the heat of the moment seem natural but in perspective be detrimental to the action and the goals. It's important to give a relatively unified message to the opposition.
People are free to choose however they want to do their genital integrity activism.
What the Non-Violence Guidelines say is that for this action the tone is to be a certain way and that people attending are expected to refrain from certain behaviors even if they don't agree with the guidelines. It's impossible to enforce the guidelines. Demonstration organizers should not tolerate anyone attending the action and sabotaging it by being verbally abusive to the opponents or violent toward property or persons. It doesn't matter if such a person is a member of the organizing group, or someone unknown. The results are equally devastating.