"Structural violence" is responsible for the greatest number of deaths worldwide according to Peter. Stefan asks for a definition. Peter gives a very abstract "definition" that boils down to social inequality as a root cause of violence. Again social inequality is such an abstract concept very difficult to define. When you talk about a cause of violence, people are the cause of violence. One person or a group of people take an action to hurt or destroy another person or group of people. So social inequality may be a motivation, but to me it sounds like an excuse to take revenge on those whom you believe to cause your low social standing and an avoidance of personal responsibility.