Those who deny the necessity of violence try to make themselves good by being harmless. There is a very important distinction between the peaceful and the harmless, for the peaceful are capable of violence and make the choice to not be so. The harmless are weak and 'will suffer what they must' per Thucydides.

This isn't to say that peace is bad. As you say elsewhere, there's a difference between starting fights vs. ending them. The strongest and most morally warranted peacemaker is a veteran, who knows both the how and the cost of violence.

Sic pacem, para bellum.