Why is war bad? It is completely natural. It happens with apes, snakes, elk, bison, wolves, and yes, humans. We are not meant to co-exist in each others spaces and do what we please. We are designed to be tribal and protective.
War has transformed since the past. Wounded soldiers were taken off the battlefield. We have evolved and invented nuclear arms. These have the potential to end humanity. Civilization has reached new means of conflict resolution. There is now an abundance of resources. Perhaps we should settle conflict like superior civilizations with a break dance battle.