That is a stupid response.
War comes down to survival and power and those are the items for both.
Pillage and plunder are real things. My family will eat at your expense. Your stuff is now mine...if I am nice I will enslave you...if not you are dead.
Fancy ideas happen at UN levels but for the citizens embroiled in battles and being overrun in their towns it is much more elemental.
My family experienced it in Wwii.