Youre saying that this "willingness to forment chage for the better" is the distinction between a martial artist and simply a fighter? If so, I disagree. To me the latter is the base definition of the former. If you use martial arts to improve the world around you, more power to you. I salute you. But it doesn't make any other practitioner any less of a martial artist
Historically, those times in Human history when people fought simply for the sake of fighting seem universally characterized as periods of devolution. The Period of the Warring States, both in Japan and in China, the tribal period prior to the Three Kingdoms in Korea, and the European Dark Ages have all been regarded as rather low points in Human history.
OTOH the development of various systems that came OUT of those chaotic periods have stood as signs of considerable development such as Chivalry in Europe, BUSHIDO in Japan and the O-GAE in Korea, right?
My sense is that the distinction is not about fighting but rather the willingness to forment change for the better SOME of which might require the need to fight. Afterall: