Look at the civil rights movement as headed by MLK Jr. He advocated a peaceful, nonviolent revolution and had thousands of followers. Although he was shot, his family attacked, his people bombed and burned and lynched, he still would not advocate the use of violence. Powerful people within the government and within the news media joined his cause, not only because it was a just revolution, but because MLK exemplified peaceful change. Even when others around him were retalliating, MLK kept on with the peaceful demonstrations and the firm but peaceful messages of freedom. It even cost him his life. But the revolution happened anyway. Without MLK or any of his followers having to raise a rifle or plant a bomb.
Pacifism works, but passivity does not. The difference is that a pacifist is a peacemaker (the word pacifism comes from the latin for "peace" and "making") actively but nonviolently works for peace and justice, but a passivist just stands by and lets the world go to hell in a handbasket without ever raising their voice.
Most anabaptists I know are passivists, letting the world around them do whatever it wants without making any attempt to influence its direction. That is not what I think Christian peacemakers are supposed to be doing.

It's counter-Christian. Jesus constantly stood among the crowds telling people about how the world is, AND how it is supposed to be (You have heard it said...But I tell you...). He didn't use violence to bring about his revolution, but he didn't just stand around saying "tsk, tsk, tsk, look how bad things are in the world today. Let's go find a remote place where we can live by our principles and leave these people to live in hell on earth."
I know that I do not take the typical historical stance for the "plain people," but the mennonite church has always been active in peacemaking and I hope that I could represent them as I am called to do so.