Some anarcho-capitalists are also anarcho-pacifists, but most anarcho-capitalists are not. Anarcho-pacifists, like Robert LeFevre, believe one may never use any force at all, not even in self-defence. Most anarcho-capitalists, however, believe it is okay to use defensive force as long as it is "only" directed against those who have used non-defensive force, and as long as it is proportional to the non-defensive force.  In other words, one may not legitimately shoot a person for stealing a stick of gum, because shooting someone is a lot more forceful than stealing the gum.