I think that a violent act is the ultimate definition of itself. It matters not whether your heart is pure - if you crush someone's elbow it is violent. If you break someones back - even if they attack you first, it is violent.
Terry told us a lovely story over twenty five years ago when we were still young - remember the story about the coal miner and the old man on the train? He was ready to do violence and the old man just did real aikido.