Dave Grossman authored a book on a related topic. He states that in wars before Vietnam a substantial portion of the soldiers intentionally did not shoot at the enemy. So chances are that even if they do not freeze up they would not shoot at a person.
Itīs not a particularly pleasant experience to find out that you would be capable of enough violence to severly injure an other human being.
This idea originated from the work of S.L.A. Marshall, the Army's Chief Historian in WW2 and Korea. Critics have since seriously questioned his work in coming up with the 'Ratio of Fire' -
Wiki -
Some veterans and historians have cast doubt on Marshall's research methods.[12] Professor Roger J. Spiller (Deputy Director of the Combat Studies Institute, US Army Command and General Staff College) argues in his 1988 article, "S. L. A. Marshall and the Ratio of Fire" (RUSI Journal, Winter 1988, pages 6371), that Marshall had not actually conducted the research upon which he based his ratio-of-fire theory. "The 'systematic collection of data' appears to have been an invention."[13] This revelation has called into question the authenticity of some of Marshall's other books and has lent academic weight to doubts about his integrity that had been raised in military circles even decades earlier.[14]
https://en.wikipedia.org/wiki/S.L.A._Marshall
Previous Topic
Index
