Somehow it must be considered the difference between draft and volunteers and professional soldiers, however. And also background (both cultural and previous c

Somehow it must be considered the difference between draft and volunteers and professional soldiers, however. And also background (both cultural and previous civil occupation) when seeing the matter at the international level. The old assumption (right or wrong) was that populations of hunters and shepherds were more familiar with slaying than more agricultural ones. And of course is an entire different thing to kill an animal (let alone a human being) with a knife or a sword (or similar) and - say - pulling a trigger of a firearm from 300 yards away or dropping a bomb/firing a missile from 10,000.