I think you are trying to mix several unrelated things. The amount of violence necessary to change something always depends on the amount of repression imposed.

I think you are trying to mix several unrelated things. The amount of violence necessary to change something always depends on the amount of repression imposed. If the repression is light/inexistent, there is no need for any violence. If the enemy is an army that is coming for combat with no opportunity for negotiations, only full scale war will work. In between these extremes, several mixes of diplomacy and violence are necessary. It is just wishful thinking to believe that peaceful protests will always work, in fact in many cases this belief serves only to demonize people who are protesting for their rights.