Why cold blooded murders in a war are not treated as a crime?The estimates of death tolls in various wars vary greatly e.g. in the World War II, the estimates range between 158 lakhs to 850 lakhs. Nonetheless, the World War II has been the bloodiest war ever waged by the humans on this planet earth.
Within India, death toll wise, some of the notorious wars have been Mughal–Maratha Wars (46 lakhs), Indian Rebellion of 1857 (23 to 33 lakhs) and Maratha expeditions in Bengal (4 lakhs).
My question is simple. Why cold blooded murders in a war are not treated as a crime?
Is there any justification of such wars which are nothing but stories of destruction, revenge, hatred and vengeance?