It asks the question, do we have to be violent to deal with violence?
Well, do we?
Well I think it depends on the definition of "Deal with". I think we must understand the causes and nature of violence in order to deal with it.
We can deal with it in many ways. Prevention and deterrence are two ways. I think it is best to deal with it on a strategic level instead when possible. We still must deal with it. We certainly can't ignore it.