I think it is hard to list all the situations but in the end it boils down to situations where both you personally as the person considering using violence and the average person could live with that decision in the long term. Both because that covers situations where you personally are a lot less or a lot more concerned with the consequences of your actions than the average person. And the average person instead of every single person because there are always some individuals whose views on the matter are a bit too extreme to be practical. Maybe instead of the average person it might make sense to use something like "90% of the population" but in the end you can't measure things that accurately anyway.