"Still, if you will not fight for the right when you can easily win without bloodshed, if you will not fight when your victory will be sure and not so costly, you may come to the moment when you will have to fight with all the odds against you and only a precarious chance for survival. There may be a worse case. You may have to fight when there is no chance of victory, because it is better to perish than to live as slaves." - W. Churchill
Self-preservation and self-defense are requites in a productive life. A commitment to non-violence to the point of death is a black hole in society. While the death of an individual or group may make a social statement, it usually doesn't highlight a best solution to anything but deaths of those killed.
Non-aggression is very reasonable goal. Failing in your own self-defense is functionally equivalent to helping plan your own murder.