First you define the expression of ideas that you disagree with as a form of “violence.” Which means you are justified in using actual violence against those ideas in the name of self defense.
From Pete Spiliakos, When Dissent is Equated with Violence | First Thoughts | Blogs | First Things:
UC Santa Barbara Professor Mireille Miller-Young is more imprudent, but no more ideologically insane than the administration of Stanford University. Miller Young forcibly took a sign from, and allegedly assaulted a pro-life protestor at her college. The Volokh Conspiracy cites the police report, in which Miller-Young argues that her actions were “in defense of her students and her own safety.” [Read more...]