Anarchy has nothing to contribute but violence.  Anarchist groups may claim to contribute to political discussion and propose a viable alternative to states, but too regularly they contribute very little more than violence, they regularly hijack legitimate peaceful protests and by acting in a violent way detract from those protests. [1] In order to be able to contribute to society they need to be able to show that they have something to contribute. People will not listen if the movement is associated with violence so anarchism will never have an opportunity to contribute while it practices violence.  [1]