Thomas Nachbar writes in Slate: “Violence can be a form of justice, and justice occasionally requires acts of violence. But, despite their occasionally close relationship, justice and violence should never be confused, even when violence is undertaken in service of the most just of causes. Osama Bin Laden was himself an accomplished engineer of violence, but no right-thinking person would think he was a source of justice.”
So, to sum up, acts of violence can either be just or unjust. Who knew?