Killing includes all killing, such as the execution of a criminal convicted of a capital offense, and the killing of an enemy soldier by a person fight a defensive war.  Both are not considered to be murder either in the bible, or in modern society.  I'd explain this further, but honestly, I went through this in much greater detail in an online forum, and I'm really just not up to doing it.  It just leads to an absurd fight that could be resolved with a dictionary but for some reason rarely is.