This voluntarism is important to understand, because one of the distinctions people protecting the anti-abortion websites make is that they are not ordering, nor do they have the machinery to order, their minions to murder doctors. They don't need to. All they need is for their minions to share their ideology, like Germans shared the ideology of anti-Semitism, for the intended and expected outcome to manifest. Consider this in relation to pornography. We know that many of those involved in violence against women consume pornography.
Pornography is propaganda of the word.
It spreads the core ideas of the patriarchy, the inferiority of women, their role as objects for men. Those who commit violence against women are the brown shirts of the patriarchy. They commit the propaganda of the deed. They set an example that makes it easier for other men to control women. Women learn to live in fear, to avoid certain areas, to be passive in conflict, to depend on their man, because there are more than enough examples of violence against women to tell them that if they want to get by in life, they had best learn their role.