Why is it inhumane to kill people during war?

Which concentration camp did the members of the Secret Annex die? What is a good rule of thumb during first day priorities of the transitioning leader? The battle between arthur's and morded's armies starts when a soldier draws his sword to kill an adder? What is the definition of army ethic? Was the 1848 springfield rifle used in the civil war? What did soldiers put on a handkerchief to protect themselves from poison gas? Why was a restaurant open and a soccer game played at the concentration camp Theresienstadt? How did the Second Continental Congress pursue a peaceful settlement with Britain? Which countries were all involved in World War 1 and 2? What role did the Canadian troops play in ww1? How did manufacturing give the North an advantage during the Civil War? How did Moshe Peer survive? What year was shrapnel invented? Where is Pretoria where the Aussies fought in World War 2? How did the Cold War impact World War 2? What were the battle conditions in world war 1? How did sherman's victory at Atlanta affect the election of 1864? How many people fought on each sides of the Battle of Bunker Hill? Who said you must not confuse dissent with disloyalty? Can people with schizophrenia be drafted into the military?