Yes, ahimsa, nonaggression, nonviolence are important. That is the default position. But there is also the requirement for self-defense, the use of MOral Lawful force to stand up , say NO, and stop the violence, which is the violation. Using force to stop violence, is not violence, it's force. Anarchy does embody this by default. Anarchy means "no rulers, i.e. no masters, no slaves, but still rules, Moral Law rules, which includes nonviolence ahimsa and self-defense to use force to stop violence.

I have some recent work on that with an inforgraphic: Be Right or Go Wrong - Ahimsa and Justice

Take care. Peace.