For instance, the consumption of meat for food was a change in the original human diet that mostly comprised of vegetables and fruits (Genesis 1). The Biblical character of Abel chose to offer the meat to God. This may have been the human soul's need for justification or acceptance.
Some cultures that have embraced violence through warfare tried to utilize a sense of nobility in their advocation. For instance, when Abraham went to battle in the early Biblical era he was careful with the allocation of the spoils from the battlefield. Also, the Spartans were a warrior-like culture but in their warfare there were rules: 1. retreating armies were not pursued 2. wounded captives were not killed 3. prisoners were often freed 4. non-combatants as well as temples/sanctuaries were spared. Another example were the Japanese warriors or samurai who had a "complete set of standards for everything from combat to personal comportment to courtly love".
Rules of conduct in warfare may indicate the need to utilize righteousness or a way of the human conscience that could be accountable to posterity. It did not advocate or embrace savagery or hatred of others. Chivalry was the call of the earlier times of warfare and a way that the most organized form of violence was accepted.