Yes. That's because the concept of oppression as used by the nationalist ideologues in the early 20th century was largely an invention designed to serve the goals of populist propaganda; it continues to be used in a very similar way by Marxian post-colonialist thought (which is not very surprising given that both nationalism and Marxian thought, opposed as they are, can be traced back to the Romanticist ideals which were in large part an overly bitter critique of logic/reason that developed initially as a reaction to the Enlightenment ideas and was later distilled/intensified during Napoleon's occupation of German states). (Link: http://en.wikipedia.org/wiki/File:Hegel-and-Napoleon-in-Jena...).

Since most people agree that the only thing that can justify violence is initiation of violence on someone else's part (which turns violence into just self-defense and actually helps maintain peace), it is very important that people make it explicit what they consider as violence and how it is initiated.