I think most conflict comes from resource scarcity and saturation. There were obviously many areas where pioneers came in attacked and stole already inhabited regions. There were also many regions where nothing was going on, no development, no people, no local economy. If you value the growth of civilization then you have to say the former is bad, the latter is good. Though you recently said something about "deep ecology", so it could be that you are not very pro-homo sapien.