I am kind of curious where Grossman gets his data, and how accurate it is.
The basic theory is primarily derived from studies about firing behaviour of soldiers in combat from numerous studies from blackpowder era to the modern day, plus parallel law enforcement studies conducted by the FBI.
As was mentioned earlier by someone who had actually been in the military, the system Grossman describes is not used...
Not really. They claimed the system had a different purpose to what Grossman claims. Since Grossman himself was in the military and taught combat psychology to US Army officers and has subsequently devoted time to studying the specific topic, I don't think you can dismiss his theories because one soldier thinks the system serves a different purpose.
As for this list,
1, this I can agree with, it's an evolutionary thing, good for the species, it makes sense.
Yup.
2, this I'm less sure of. You take a reasonably happy person in a normal environment, put them in front of a serial killer and give them a gun, telling them to kill them, then yeah, you are not going to get very many people who would do it, but you will get some.
Well hang on, you're getting into different territory here. The whole dynamic is pretty complex, and the proximity to an authority figure has a big influence on overcoming the resistance, as demonstrated by the Milgram experiment. Marshall's surveys from WW2 indicated that most soldiers
would fire when under the direct coercion of an authority figure.
Put those same people into a stressful environment, where their life was in danger, one where killing was necessary to stay alive, and the number of people willing to pull the trigger is going to go up significantly. While true many people still would have a hard time of it, a lot of people would still be able to, which brings us to,
Except the research on people who actually were in stressful environments, whose life was in danger, and where killing was deemed necessary to stay alive (i.e. soldiers and law enforcement) says otherwise.
3. WWII, and Vietnam, were wars filled with draftees. This means you get about the same mix of people who could pull the trigger vs couldn't as you would in the general public, so naturally you are going to get a lot of people who have difficulty killing, especially when most of those soldiers are still practically kids.
Except that this isn't the case. Between WW2 and Vietnam the US Army introduced conditioning techniques and the rates of firing increased dramatically. Both draft armies. Dramatically different firing rates.
This is certainly an issue with a draft based army, however, between WWII and now things have changed. With a volunteer army comes the fact that people who actively decide to join the army are people who have made a conscious decision to be willing to die, and or kill, for their country, thus the number of people in the armed forces who are also willing to pull the trigger is going to be very high.
The FBI found similar rates of non-firing amongst law enforcement officers, who are all volunteers. Similar rates are found in WW2 amongst both volunteer and drafted units.
Further, countries such as Israel and many European countries, which maintain some form of conscription, still see the improved firing rates due to new training techniques. Finally, most nations during WWI only introduced conscription part way through the war, but there was no subsequent change in the lethality of units, again indicating that whether the soldier wants to be there or not has little bearing on their willingness to fire at the enemy.
Depending on when and where Grossman got his numbers to support point 6
From numerous studies of combat firing rates amongst soldiers and law enforcement personnel since new training techniques have been introduced. Including the Vietnam War, FBI studies, studies of the British in the Falklands, etc.
this could have very much skewed the results, regardless of any program the army may have put in place, and given a very large false positive, rendering the claim that the program was highly effective baseless.
Not sure how you think these independent and unrelated studies could have all found the very same very large false positive.
That some games mimic this system is meaningless, as the system may not actually even work
Sure. But the studies conducted on this matter indicate the system does work. So...
and even then, shooting a gun in a game in no way can compare or prepare you to fire a gun in real life.
Why not?
There is no reason to assume that killing in a game and killing in real life is any different.
Huh?
To try another analog, I've probably landed a 747 hundreds of times in flight sim X (with a nice saitec setup too

), but I've never flown anything for real. I can assure you, if we were on a 747, and lost the pilot and co-pilot, we'd be in much better hands with the guy who doesn't have a clue what the cockpit of a 747 looks like, but has been flying Cessnas for years, than we would be with me, who know's what all those buttons do, and how to operate the computer, but have never touched a real control stick in my life.
I'm not sure why you think this is a relevant comparison. We're not talking about technical or mechanical proficiency. We're talking about psychological conditioning.
Are you suggesting that humans have a natural resistance to landing aircraft, and require psychological conditioning before they can do it?
ETA. Incidentally, while it's true you might prefer a Cessna pilot to do it, actual tests and studies conducted in relation to 9/11 (and indeed the event of 9/11 itself) indicates your concerns are probably unfounded, and in fact all pilots, obviously, learn how to land a given commercial aircraft in a flight simulator and not in an actual aircraft. What you'd be crucially missing, as a gamer, is an understanding of aerodynamics theory (and even then not necessarily - I understand it quite well and I've not played a flight simulator game since I was about 12).
In the same way, a gamer won't have learned fire-and-maneuver, radio communication, the general physical fitness, and a host of other vital skill-sets that make a combat soldier what they are (well, they might have picked some of them up, depends on the games they play). But what's really critical to grasp and understand here is that all of that - all of the knowledge and expertise and mechanical proficiency with weapons and fitness and familiarity with the equipment and spacial awareness and all of that, is
totally separate from the ability to kill. And I do mean
totally separate.
Blackpowder battlefield soldiers were drilled to the point where they could
literally perform musket drill blindfolded. Some could produce firing rates at drill as high as six rounds a minute or more, which given the number of actions required, is phenomenally fast. Drilled to perfection. At 75 yards separation, the expected hit rate by soldiers using smooth-bore muskets on a 100ft x 6ft target was 60%. Based on these firing rates, if blackpowder regiments actually fired at the enemy, units would have been annihilated in a matter of minutes. A 200-man regiment at 75 yard should be able to kill or wound almost 500 men per minute. And yet reenactment of blackpowder battlefields consistently fine kill rates of 2 or 3 men per minute. There are endless documented cases of regiments engaging each other at 50yards separation for hours on end, until they exhausted their ammunition. Why? Because the soldiers
would not fire. A small percentage of people would fire (about 2% of people don't naturally have this resistance to killing), and everyone else would either a) fire away from the enemy b) go through the entire drill process but skip pulling the trigger or c) engage in support activities such as loading for those who were firing, recovering wounded, etc.
At the Battle of Cold Harbor on 3 June 1864, Union soldiers held their positions (anywhere from 200 yards to as close as 40 yards from the enemy) for
eight hours being slowly cut to pieces by Confederate artillery. For eight hours they maintained discipline and displayed phenomenal bravery in holding the line, just as they'd been trained to do, digging makeshift trenches on open ground. For eight hours they went through their musket drill. And for eight hours they failed to kill the enemy. Seven thousand Union soldiers died in those forward positions, almost exclusively from artillery. Confederate casualties were negligible.
Why?
Because there is a resistance to killing that functions independently to combat skill and weapons proficiency and courage and motivation, and justification, and only a very specific system of conditioning can disable it.