It’s garbage. The idea comes from Grossman and his horrible research. When he isn’t misinterpreting Marshall or reaching for ridiculous conclusions not proven by the data he is making things up completely.
Soldiers firing high in battle doesn’t necessarily mean it’s because they don’t want to kill. When I see soldiers firing high, it is because they are firing without aiming while lying down behind cover. Horrible shooting technique to be sure, but it’s not because they don’t want to kill. It’s because they are trying not to die.
And the stats about not everyone firing in a battle doesn’t mean people didn’t want to shoot and kill. It can easily mean that people simply could not pinpoint an enemy to shoot at. Can’t count how many times my men and I wanted desperately to kill the enemy, yet simply could not fix them long enough or certain enough to get shots off. More time was spent frustratingly observing and frantically searching downrange than actually shooting. That wasn’t for lack of a want to kill.
Grossman is the type of person who wants something to be true, so he presents it as the only possible answer to myriad data, quotes and statistics–none of which actually prove his point. I couldn’t disagree with his conclusions anymore and I am not the sole critic of his work.