The fact is there is nothing that you can trust; and that is a terrible fact, whether you like it or not. Psychologically there is nothing in the world, that you can put your faith, your trust, or your belief in. Neither your gods, nor your science can save you, can bring you psychological certainty; and you have to accept that you can trust in absolutely nothing.
Violence is not merely killing another. It is violence when we use a sharp word, when we make a gesture to brush away a person, when we obey because there is fear. So violence isn't merely organized butchery in the name of God, in the name of society or country. Violence is much more subtle, much deeper, and we are inquiring into the very depths of violence.